Water Supply Fill Dishes for RV, Mobile Food Unit and More Class A Customs

Posted by on 4/17/2020 to Food Vendor FAQ's & Tips

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 fresh water tank without the need of opening a compartment or climbing under your unit. The fills dish also includes a small vent that allows you to connect your water tank vent to the outside of the unit, if your tank overflows it will overflow outside your unit. You can find the fill dishes in the Plumbing Category.

For adding water to the Fresh / Gray Water Tank you need a Gravity Fill Dish
the food safe garden hose rests in the fill port on the fill dish - it does not screw onto the port
this is a non-pressurized fill

For using water directly from a food safe garden hose you need a City Fill Dish
The plumbing will bypass your water tank and hook directly to your water heater and faucets.

The food safe garden hose makes a sealed connection on the fill dish and the water supply is pressurized.

This is a pressurized line and can NOT hook to your water tank - pressurizing the tank will cause the tank to explode, fittings to pop-out, cracks to tank, etc.

Units that have metal water tanks can use city fill dishes because the metal tank can withstand the pressure, Class A Customs water tanks can not be 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.

How do I get water from the fill dish to the water tank?

How do I vent the tank?

Do you have plumbing for this?

Class A Customs Basic Plumbing Kit

Designed for Class A Customs Stock Fresh Water Tank set-up using a Fill Dish (fill dish not included)

This is for Fresh Water Systems Only - Not to be used for Gray or Waste Water Systems

Kit does not fit a SPOUTED Water Tank

EXAMPLE PLUMBING FOR FRESH WATER SYSTEM

Visit our Water Fill Dishes Category under Plumbing.

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

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. 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. Very little, if any, pipe thread tape is needed using too much pipe tape will damage the threads. We do not recommend pipe dope as you can not remove the fitting later, if used be sure to use a food safe brand. Do not over-tighten fittings as damage will occur.

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.