~ Fresh and Gray Water Tank Information ~
BPA FREE Class A Customs does not carry this chemical nor uses it in the manufacturing process
NSF CERTIFIED MATERIALS Tank & fittings made from DOW NSF International NSF/ANSI Std 61 approved Medium Density Polyethylene (MDPE) Resin
U.S. FDA 21 CFR 177.1520 (c)3.1a
Canadian HPFB No Objection
Underwriters Laboratories Inc.
EU, 10/2011
NSF International NSF/ANSI Std 61 (sec 4 & 5)
NON-PRESSURIZED TANK all tanks we carry must be vented (allow air in/out during use), Plumbing Example
FRESH OR GRAY WATER USE ideal for rvs, food vendors and extra water storage
COLOR Creamy White in color so you can see waterline through tank
MADE FROM Medium Density Polyethylene (MDPE) Resin - glues do not stick to this material and easily cleaned.
The tank looks like the side is bowed, is it safe?
Due to the manufacturing process all the tanks especially the larger in size will have a bowing to the walls, when the tank is filled the tank will expand out removing the inward bow, we recommend laying all tanks on a level surface (this can be angled) and bracing the tanks. For larger tanks it is recommended to brace all side walls with plywood or metal, we do not recommend using ratchet straps on the tanks alone as this is a large amount of weight on a thin strip and may cause cutting into the tank.
I have only so much room how many gallons can I get in that space?
We do not recommend sizes or verbally give measurements please look at the Water Tank List located at the top of each webpage to see all tanks Class A Customs currently manufactures.
How are the water tanks measured?
Please be sure to look at the photos provided with each item as measurements and fitting placements will be included. Measurement of the tanks do not include the fittings, this will add extra length to the tank.
Do you have a list of water tanks used in vehicles?
Unfortunately we do not have a list or way to cross reference what tank you have or had in your unit when manufactured, check with the vehicle manufacturer or look for part number on tank.
Do you know if someone has used a _____ tank in a ______ ?
No, we do not have a list of vehicles, uses or projects people have done with our tanks.
Other Water Tank Suppliers
~ Fittings ~
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At this time Class A Customs only installs the following fittings into our Fresh / Gray tanks
.5" NPT Female
1.5" NPT Female
1.25" Outer Diameter x 2" Long Smooth Pipe / Boss Fitting (glues does not stick to pipe, it can not be sealed or capped)
If you are a manufacturer or OEM needing custom fittings please contact sales for more information, minimum quantity of 50 tanks will apply.
There is glue flaking on my tank!
No 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.
Blank Tanks (no fittings installed) are available but due to customer confusion we have removed them from the online store.
If you are wanting a Blank Tank please note this in the customer comments section of the order when checking out, this will add up-to 7 days to the lead time.
Example: On my order Tank T-1800 is a BLANK TANK all other tanks have fittings. Thanks --- OR ---- All Tanks Blank Tanks. Thanks
Can I cut a hole in the tank and glue another 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.To add fittings or repair a damaged fitting we now offer Uniseal Fittings, please watch the included video for information.
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Have a certified technician install all parts to prevent product damage and personal injury. All water tanks we carry must be vented, they are not pressurized tanks.
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.
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.
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.
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, not making a secured connection as this would then be pressurized.
You would 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.
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What fittings will I need for my plumbing?
This will depend on how you are setting-up your tank and will vary by application, we are not aware of what items you will be needing. Be sure to Sanitize Tank before installing.
It is recommended to use plastic NPT male fittings with plastic female NPT fittings to avoid damaging the threads, metal thread fittings can crush the plastic threads.
Please view our Plumbing Category for information on loose fittings we carry.
Can I hook more than one tank together?
Yes, 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.
Build A Food Truck Helpful Video Series
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.
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.
PEX Plumbing Information
~ Installing & Bracing ~
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Can I install the tank under the trailer?
Do I need to brace the water tank, the wall looks bowed?
Can I stack the water tanks on top of each other?
No, do not place anything on the tanks, if you need to stack the tanks you will need a weight bearing shelf between them.
Sanitize each tank prior to use to remove any debris from the manufacturing process. Tanks are made in a warehouse so maybe dusty or scuffed, this does not effect the use or safety of the tank, wipe with a damp cloth to remove surface dust or scuffs.
1. Prepare a chlorine solution using one gallon of water and a ¼ cup of household bleach (5% sodium hypochlorite solution)
** DO NOT USE FRESH SCENT OR ANY SCENT ENHANCED BLEACH **
Never mix bleach with ammonia or other cleaners.
Open windows and doors to get fresh air when you use bleach.
With tank empty, pour chlorine solution into tank. Use one gallon of solution for each 15 gallons of tank capacity.
2. Complete filling of tank with fresh water.
3. Allow to stand for three (3) hours
4. Drain and flush with potable fresh water.
Any residual chlorine odor will dissipate naturally.
~ Monitor Panels & Water Tank Probes ~
RV Monitor Panels allow you to monitor the amount of fluid in your water and waste tanks along with the battery power level. Typically only one monitor panel (2 tank or 3 tank) is needed per vehicle/unit and 4 Probes per tank.
Class A Customs currently offers three styles of RV Water Tank Monitor Panels
All styles require a 12 volt power supply - do not hook to any other power supply or damage will occur.
To check fluid levels, press and hold the button designated for the tank and read the level indicators on the panel. Sometimes, residue on the sides of a tank, or water with a low mineral content will give a false reading. Check the levels occasionally when you are sure of a tank’s contents and compare it to the reading on the monitor panel.
Water Tank optional Installed Water Tank Probes, Loose probes are available for customer installation.
For Step-by-Step Photos visit our Blog Post Water Tank Monitor Probes
MADE WITH Recycled Medium Density Polyethylene (MDPE) Resin
SEAMLESS One piece seamless construction, no seams to burst
OUTLET
3” PVC Female Pipe - outlet can not be moved
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.
Included are a few short videos displaying the grommet installation process.
Brace tank to prevent tank from moving during transit
Do Not hang by ratchet strap, this is too thin and will not adequately support tank.
Do Not place weight on tank, if you need to stack the tanks you will need a weight bearing shelf between them.
Due to the variety of installations we do not carry brackets or bracing systems.