RV Waste Water Tank Grommets Installation Instructions

Posted by on 8/5/2022 to Waste Water Tanks





Gray Water Tanks are used to hold used water from handwashing sinks, dish sinks, and showers.

Black Water Tanks are used to hold Human Waste and/or used water from handwashing sinks, dish sinks, and showers.

Class A Customs Tanks that are white in color can be used for either Fresh or Gray Water use.

Class A Customs Tanks that are black in color can only be used for Waste or Gray Water use, do not use a black tank for fresh or drinking water.



If you want to place your tank directly under your sink or shower you can use a Uniseal Fitting to install a fitting directly where needed to allow the pipe to go into the tank.








Class A Customs Waste Water Tanks only come with the ABS outlet installed, the end user will determine where the inlet and vent will need to be placed and install (parts are not included). End user will need to determine size of grommets/Uniseal to be used based on piping and/or toilet flange pipe size.



RV WASTE TANK INSTALLATION HELP VIDEO




GROMMET INFORMATION

Grommets are not food safe so can only be used for Gray or Waste Water use they are available in sizes 1.5" and 3", no adhesives are needed for use, many customers use adhesive just as an added precaution.



Hole Saw Needed 3.75"


Hole Saw Needed 2.25"





Use correct size hole saw bit in order to drill a hole in the tank, smooth tank edges, and place Grommet or Uniseal in hole. Piping is then placed into fitting with no glues or adhesives necessary.

After installation of grommet into tank hole, drain pipe goes inside tank grommet and is sealed.

Customer will measure and determine where inlet will be placed on Black Waste Tank.
Use correct size hole saw bit in order to drill a hole in the tank and place grommet in hole. Grommet will secure inlet pipe with no adhesives needed.




UNISEAL FITTINGS INFORMATION

Uniseal Fittings are food safe and can be used for Fresh, Gray, or Waste Water use, they are available in size .5" to 3", no adhesives are needed for use



Uniseal® Pipe-to-Tank Seals

Uniseal® is the world's best seal, and installing it is a simple process. After cutting a hole in the wall of a tank or other surfaces, the seal is inserted. Then the pipe is coated with a slippery detergent and pushed into the seal. The Du Pont Alcryn® is the key to the liquid-tight seal. When the pipe is pushed through the rubber-like Uniseal® from the outside, the inside Alcryn® wall becomes thin enough to allow the pipe to squeeze through and then forms a liquid-tight seal. The coefficient of friction with the plastic pipe is roughly three times higher than any other material, which allows it to create a better seal than with any other material.

  • Alcryn® melt-processable rubber
  • Long-lasting
  • Resistant to acids, oils, greases, gasoline & sewage
  • Withstands pressure & suction
  • Withstands heat & cold
  • Easy installation
  • Reduced labor & material costs
  • In static conditions, the seal is good up to 65 psi
Installation Instructions and Video at Bottom

Search Uniseal in top search bar or look in Plumbing Category.

Uniseal®

Part No

Uniseal® Size

Sch 40 Pipe I.D.

 

Pipe O.D. Size *2

 

Holesaw Size Required

 

 

Imperial

Metric

 

Imperial

Metric

 

Imperial

Metric

 

U018

3/16"

4.75mm

 

0.250"

6mm

 

0.315"

8mm

 

U025

1/4"

6.5mm

 

0.375"

9.5mm

 

0.5"

12.7mm

*1

U0312

5/16"

8mm

 

0.40"

10.5mm

 

0.5"

12.7mm

*1

U038

3/8"

9.6mm

 

0.675"

17mm

 

1.0"

25.4mm

 

U050

1/2"

12.7mm

 

0.84"

21mm

 

1.25"

31.7mm

*1

U075

3/4"

19.2mm

 

1.050"

27mm

 

1.25"

31.7mm

*1

U100

1"

25.4mm

 

1.315"

33mm

 

1.75"

44.4mm

 

U125

1 1/4"

32mm

 

1.66"

42mm

 

2"

50.8mm

 

U150

1 1/2"

38mm

 

1.9"

48mm

 

2.5"

63.5mm

 

U200

2"

51mm

 

2.375"

60mm

 

3"

76.2mm

 

U275

2 3/4"

70mm

 

2.913"

74mm

 

4"

101.6mm

*1

U300

3"

76.2mm

 

3.5"

89mm

 

4"

101.6mm

*1

U400

4"

102mm

 

4.5"

114mm

 

5"

127mm

*1

U400-SDR35

4"

102mm

 

4.33"

110mm

 

5"

127mm

*1

*1 - Uniseals U025 and U0312, Uniseals U050 and U075, Uniseals U275 and U300, Uniseals U400 and U400-SDR35 require the same sizes of holes.

The difference is made up in the thickness of the Sarlink 4165 rubber.


*2 - Always measure the Outside Diameter (O.D.) of your pipe. This is the most important size to match into the Pipe O.D. hole size of the Uniseal to create your seal.

Instructions

1. Be sure to have recommended hole saw for selected fitting, check chart before cutting.
2. Using hole saw cut hole in wall, ensure that the hole is cut clean. Irregular holes could cause poor seating and possible leaks. File or sand the edges so there are no rough or sharp edges be sure to remove any remaining debris.
3. Insert the Uniseal with the wide surface facing out.
4. Make certain the pipe to be inserted is cut clean and square, file or sand the edges so there are no rough or sharp edges to cut the Uniseal surface.
5. Use liquid soap or Teflon lube on the pipe to be inserted. Insert the pipe into the Uniseal as far as needed to clear the inside of the seal by about 2".
6. Be sure to clean tank thoroughly prior to using removing any debris and lubricant residue.





Do you have mounting brackets for your waste water tanks?
Class A Customs Waste Water Holding Tank "J" Style Bracket will only work with tanks that have a lip or mounting place, they will not work on smooth edge tanks with no lips.

Gusseted or Non-Gusseted
Made from steel
Powder coated black
End user will need to determine amount of brackets needed for water tank.

Available in 4 or 6 packs

GUSSETED STYLE (Has side piece welded to offer added strength)







FEBRUARY 2025 LIST OF TANKS THAT HAVE BRACKET POCKETS



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