All water tanks Class A Customs carries must be vented, they are not pressurized tanks.
Have a certified technician install all parts to prevent product damage and personal injury.
Tank must have a large enough opening for air to freely move in and out of tank, this is called "venting" the tank. If tank is not properly vented tank will explode when filled or implode when emptied.
A garden hose is a pressurized water line, do not make a secured connection to the water tank with a pressurized line. Tanks need to be gravity feed, this allows for air to escape while the water is going into the tank.
Tank must have a large enough opening for air to freely move in and out of tank, this is called "venting" the tank. If tank is not properly vented tank will explode when filled or implode when emptied.
A garden hose is a pressurized water line, do not make a secured connection to the water tank with a pressurized line. Tanks need to be gravity feed, this allows for air to escape while the water is going into the tank.
Our Basic Plumbing Diagram shows how an RV or food unit can be set-up using a gravity fill dish. Gravity Fill Dish Instructions
At this time Class A Customs only installs the following fittings into our Fresh / Gray tanks
If you are needing custom fittings please contact sales for more information, minimum quantity of 50 tanks will apply.
If you are needing custom fittings please contact sales for more information, minimum quantity of 50 tanks will apply.
1.5" NPT Female - fitting is closed
use a razor knife to cut membrane out, easiest when cut in halves
use a razor knife to cut membrane out, easiest when cut in halves
1.25" Outer Diameter x 2" Long Smooth Pipe / Boss Fitting - Spout
glues does not stick to pipe, it can not be sealed or capped
you will need to use the 1.25" Hose with Clamp
glues does not stick to pipe, it can not be sealed or capped
you will need to use the 1.25" Hose with Clamp
Blank Tanks - no fittings
installed in tank - can be done. You will need to verify the lead time
on Blank Tanks as we spin the fittings into tanks as soon as made.
If
we are currently making a tank we can get you a Blank Tank very
quickly, shipping next business day, however, if we are not currently
making a tank it can take up-to several weeks to get a tank.
You can call or use the contact us form to ask about lead times on the Blank Tank you are needing.
When ordering
a Blank Tank place the tank(s) you are needing in your cart and at
check-out in Customer Comments specify what tanks are to be Blank:
Part # of Tank is a BLANK TANK
All Tanks Are BLANK
Where are the fittings located on the tanks?
Are there fittings on both ends of the tanks?
Please look at the photos of each tank as fitting placement can vary by tank, typically fittings are all located on one end of the tank.
Are there fittings on both ends of the tanks?
Please look at the photos of each tank as fitting placement can vary by tank, typically fittings are all located on one end of the tank.
How do I get the large fitting out?
Are these punch out fittings?
Each
tank will come with at least one vent hole made during the
manufacturing process (this is not the vent hole for when using the
tank), a permanently mounted patch is placed over this hole, this is not
a fitting and does not unscrew.
Can I cut a hole in the tank and glue another fitting in?
There is glue flaking on my tank isn't this from gluing the fitting in?
No,
fitting are spun welded into the tank, friction between the fitting and
the tank causes both to melt and permanently seal, no additional glues
or sealants are used to install the fittings. The residue left by
putting the fittings in place is part of the material the tanks and
fittings are made from and may spider crack or flake off over time, this
in no way harms the tank or causes any usage issues. To add fittings or
repair a damaged fitting we now offer Uniseal Fittings which allow you to put a fitting in any location, sizes range from .5" - 3"What fittings will I need for my plumbing?
We
are not aware of how to set-up your tank, set-up will vary by each
application this is something you need to research. Have a certified
technician install all parts to prevent product damage and personal
injury. Please view our Plumbing Category for information on loose fittings we carry. Be sure to Sanitize Tank before installing.
Designed for Class A Customs Stock Fresh Water Tank set-up using a Fill Dish
Kit does not fit a SPOUTED Water Tank
Due to the vast amount of plumbing
applications and set-ups needed for RV's, concession trailers, tiny
houses and more we aren't aware of what all items you will be needing
for your project.
We are including some helpful links
to items you may be able to use for your application, we do not sell
these items - you are going to a new website by clicking the links. As
with all purchases be sure to verify what you will be needing before
purchasing.
Only use this with tanks that will overflow outside of your unit, you do not want to overflow inside of unit.
What is a fill dish?
The fill dish is located on the outside of your unit so that you can easily add water to your tank without the need of opening a compartment or climbing under your unit. You can find the fill dishes in the Plumbing Category.
The fill dish is located on the outside of your unit so that you can easily add water to your tank without the need of opening a compartment or climbing under your unit. You can find the fill dishes in the Plumbing Category.
For adding water to the Water Tank you need a Gravity Fill Dish,
the hose rests in the port it does not screw onto the port this allows
you to place a garden hose into the Gravity Fill Dish port without
making a sealed connection so the supply is not pressurized.
We carry Gravity Fill Dishes, City
Fill Dishes and Combo Fill Dishes that have both gravity and city, the
benefit of having both is you can have a water tank of fresh water but
if you go to a location that supplies pressurized water (campground -
fair - etc.) you do not need to use your water tank supply of water you
can simply use the water provided. Be sure to look at the provided
example plumbing diagram for more reference.
For my application I am not using a fill dish.
For
gravity feeding you can place a larger fitting such as a PVC elbow in
the tank and allow your hose to rest in this when filling, do not make a secured/sealed connection as this would then be pressurized.
You
will still need to vent the tank, this can be as easy as placing a
fitting with a screen secured over it. Be aware that if you overfill the
tank the excess water will exit the vent fitting, placing the vent
fitting overflow to an outside location is recommended. Be sure to
screen over the vent fitting overflow to prevent anything from entering
the tank. Do not over-tighten fittings as damage will occur.
Examples of Items to Vent Tanks - We do not sell these products they can be found online
Oatey® 1.5 in. NPT ABS In-Line Vent
Straight, Black Plastic Tank Vent
Examples of Items to Vent Tanks - We do not sell these products they can be found online
Oatey® 1.5 in. NPT ABS In-Line Vent
Straight, Black Plastic Tank Vent
For my application I am going to use a pressurized line to the tank.
This will void any warranty on the tank.
Turning a garden hose on half way does not work because you can control
the amount of water flowing but not the pressure in the line, leaving
the tank to fill risks exploding the tank. Examples of Fittings you could use, depending on your application.
Can I hook more than one tank together?
Yes, sometimes this is called to "daisy chain" the tanks together. You will need to check with a certified plumber to see what fittings and set-up will work best for your unit, remember to vent each tank.
Yes, sometimes this is called to "daisy chain" the tanks together. You will need to check with a certified plumber to see what fittings and set-up will work best for your unit, remember to vent each tank.
I bought a fitting from my local hardware store and it won't fit.
Be sure you are using NPT fittings and getting the correct sizes. Do not
over-tighten fittings as damage will occur. It is recommend to use
plastic fittings with the plastic fittings installed in the tank to
prevent damage to the fitting threads.
National Pipe Threads (NPT)
Pipe
sizes do refer to physical dimensions, but the plumbing industry
standard for the sizes of pipe is not always as straight-forward as
measuring the pipe. Measuring the pipe will oftentimes mislead you into
choosing the wrong pipe, so do take care. The "pipe thread size" as
shown in column 3 of the table below is measured and based on the inside
of the pipe. But, to actually determine the size of a pipe, the outside
diameter of each pipe or fitting must be measured and compared to the
table for size identification. For example, a 3/4" NPT pipe thread has
an outside diameter of 1.050 inches. Each thread size has a defined
number of threads per inch (TPI). The 3/4" NPT pipe thread has 14
threads per inch. Both the TPI (threads per inch) and OD (outside
diameter) of the thread are required for positive identification of
thread size because several sizes have the same TPI.
Male
threads: Measure the outside diameter of the large portion of the thread
at "A"; Find figure nearest this dimension in column 1 or 2 of chart.
The dimension in column 3 will be your nominal pipe thread size.
Female Threads: Measure top diameter of thread at "B"; Find figure nearest this dimension in column 1 or 2 of chart. The dimension in column 3 will be your nominal pipe thread size.
Q."What does 'nominal' mean?"
A.
Nominal is the term used to describe pipe and fitting measurements in
plumbing. Nominal refers to the inside diameter of the pipe which varies
by wall thickness of the pipe.
Q."Ok, so IPS pipe sizing isn't actually a dimension. So what about the fittings?"
A. Pipe fittings are "sized" by the "size" pipe they fit. So, for example, a 1/2" IPS fitting would fit 1/2" IPS pipe.
National
Pipe Threads (NPT) have tapered threads. These are the most common
threads used for general purposes. NPT threads are designed with a 60
degree thread angle, and are used for joining and sealing pipe to
fittings in low pressure air or liquids and also mechanical
applications. The tapered thread is 3/4" over one foot of length.
Tapered threads are deeper at the end of the pipe and are increasingly
shallower the further they are from the end of the pipe. The taper on
the pipe only allows the pipe to screw inside the fitting until it is
forced to stop because of the taper. The distance the pipe can be
screwed into the fitting is specified by the ANSI standard. After
tightening with a wrench the threads may have slight spaces between the
pipe and fitting which could cause a leak so a pipe sealant must be used
to ensure any gaps are filled.
The Dry-seal thread (NPTF) also have tapered threads. NPTF threads are used when the application is such that pipe sealing compounds may fail due to higher heat or pressure than normal NPT threads can withstand. The threads are designed to seal mechanically by slightly, but sufficiently, crushing the threads when tightened with a wrench. This allows for joining the pipe and fitting without sealants.
The NPT and NPTF threads can be interchanged if sealants such as PTFE tape or suitable pipe joint compounds are used. None of the other thread standards are fully interchangeable (GHT, NST, BSPT, NPSI, etc.) Female NPT threads can be designated as "FPT" or "FIP" and male NPT threads can be designated as "MPT" or "MIP".
National Standard Free-Fitting Straight Mechanical Pipe Threads (NPSM) have straight threads which are only used for joining. A washer or gasket is needed to seal this type of threaded connection.
There are also three less common thread types used in the plumbing industry. The Garden Hose Thread (GHT) and the Fire Hose Thread (NST) have coarse threads. The seal is made with a gasket or washer and are used mainly for attaching (joining) hoses to valves quickly, without the use of a wrench. The British Standard Taper Pipe Thread (BSPT) has a 55 degree thread angle (NPT are 60 degree) and is used internationally as a standard thread for joining steel pipes.
The Dry-seal thread (NPTF) also have tapered threads. NPTF threads are used when the application is such that pipe sealing compounds may fail due to higher heat or pressure than normal NPT threads can withstand. The threads are designed to seal mechanically by slightly, but sufficiently, crushing the threads when tightened with a wrench. This allows for joining the pipe and fitting without sealants.
The NPT and NPTF threads can be interchanged if sealants such as PTFE tape or suitable pipe joint compounds are used. None of the other thread standards are fully interchangeable (GHT, NST, BSPT, NPSI, etc.) Female NPT threads can be designated as "FPT" or "FIP" and male NPT threads can be designated as "MPT" or "MIP".
National Standard Free-Fitting Straight Mechanical Pipe Threads (NPSM) have straight threads which are only used for joining. A washer or gasket is needed to seal this type of threaded connection.
There are also three less common thread types used in the plumbing industry. The Garden Hose Thread (GHT) and the Fire Hose Thread (NST) have coarse threads. The seal is made with a gasket or washer and are used mainly for attaching (joining) hoses to valves quickly, without the use of a wrench. The British Standard Taper Pipe Thread (BSPT) has a 55 degree thread angle (NPT are 60 degree) and is used internationally as a standard thread for joining steel pipes.
Waste Tank Venting and Plumbing
Class
A Customs Black Water Tanks only come with the outlet the end user will
determine where the inlet and vent will need to be placed and install.
Grommet (not food safe - waste tank use only) or Uniseal (food safe - fresh/gray/waste use) will secure inlet/vent pipe with no adhesives needed.
Grommet (not food safe - waste tank use only) or Uniseal (food safe - fresh/gray/waste use) will secure inlet/vent pipe with no adhesives needed.
Use
correct size hole saw bit (listed on item page) in order to drill a
hole in the tank and place Grommet or Uniseal in hole, piping is then
placed in fitting with no glues or adhesives necessary.
Waste Water Tank Installed Outlet
Black Waste Tanks - 3” ABS Female Pipe - outlet can not be moved -
Gray Waste Tanks - 1.5" ABS Female Pipe - outlet can not be moved - smaller outlet this tank is for dirty water from shower, handwashing, dish-washing
Do Not over-tighten fittings damage will occur.
Dump Valves are not connected directly to the Waste Tank ABS Outlet Fitting, the ABS Outlet Fittings are female fittings and the dump valves are also female fittings, they do not connect.
Black Waste Tanks - 3” ABS Female Pipe - outlet can not be moved -
Gray Waste Tanks - 1.5" ABS Female Pipe - outlet can not be moved - smaller outlet this tank is for dirty water from shower, handwashing, dish-washing
Do Not over-tighten fittings damage will occur.
Dump Valves are not connected directly to the Waste Tank ABS Outlet Fitting, the ABS Outlet Fittings are female fittings and the dump valves are also female fittings, they do not connect.
Use PVC or ABS pipe to
connect to the 3" ABS Outlet Fitting installed on the waste tank, the dump
valve is then connected to the pipe.
We do not sell glues, Examples Oatey 4-fl oz Green PVC/Abs Transition Cement
You will still need to vent the tank, this can be as easy as
placing a fitting with a screen secured over it. Be aware that if you
overfill the tank the excess water will exit the vent fitting, placing
the vent fitting overflow to an outside location is recommended. Be sure
to screen over the vent fitting overflow to prevent anything from
entering the tank. Do not over-tighten fittings as damage will occur.
Examples of Items to Vent Tanks - We do not sell these products they can be found online
Oatey® 1.5 in. NPT ABS In-Line Vent
Straight, Black Plastic Tank Vent
Examples of Items to Vent Tanks - We do not sell these products they can be found online
Oatey® 1.5 in. NPT ABS In-Line Vent
Straight, Black Plastic Tank Vent
