All water tanks we carry 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.


Our Basic Plumbing Diagram shows how an RV or food unit can be set-up using a gravity fill dish.



At this time Class A Customs only installs the following fittings into our Fresh / Gray tanks
.5" NPT Female - fitting is open
1.5" NPT Female - fitting is closed, 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)

If you are a manufacturer or OEM needing custom fittings please contact sales for more information, minimum quantity of 50 tanks will apply.








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.






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. Examples of Fittings you could use, depending on your application.

All water tanks we carry 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. Our Basic Plumbing Diagram shows how an RV or food unit can be set-up using a gravity fill dish.


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.


 

3/8


 
1/2

 
Only use this with tanks that will overflow outside of your unit, you do not want to overflow inside of unit.
Suction Line Strainer that Fits Over 1/2


 

Dometic Universal Holding Tank Cleanout Kit

 

Oatey® 1.5 in. NPT ABS In-Line Vent

 

Straight, Black Plastic Tank Vent


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