Seal the Deal with the 3" Uniseal Grommet for a Leak-Free Connection
The 3" Uniseal Grommet creates a strong, watertight seal between your PVC Schedule 40 pipe and tank, fitting 3" inner diameter pipes and tank walls up to 3/8" thick. Made in the USA, this durable black grommet installs easily with a 4" hole saw—perfect for secure, leak-free tank fittings.---
3" Uniseal Grommet - Black U300
This grommet will connect your PVC Schedule 40 pipe to your tank and create a seal on your tank that will last!
Fitting Specifications:
- Pipe ID - 3" (76mm)
- Pipe OD - 3.500" (89mm)
- Hole Saw size: 4" (101mm)
- Up to 3/8" Wall Thickness. (9mm)
Sold in Each and made in the USA
Installation tips: Measure twice and after cutting your hole, smooth out any rough edges to get the best seal.
| Color | Black |
|---|---|
| Hole saw size (inches) | 4 |
| Hole saw size (millimeters) | 101 |
| Pipe inner diameter (inches) | 3 |
| Pipe outer diameter (inches) | 3.5 |
| Maximum wall thickness (inches) | 0.375 |
| Pipe inner diameter (millimeters) | 76 |
| Pipe outer diameter (millimeters) | 89 |
| Maximum wall thickness (millimeters) | 9 |
- What size pipe does the 3" uniseal grommet fit? The 3" Uniseal Grommet fits a pipe with an inner diameter of 3" (76mm) and an outer diameter of 3.5" (89mm).
- What size hole do i need to cut for installing this uniseal grommet? You need to cut a 4" (101mm) hole to install the 3" Uniseal Grommet.
- What is the maximum tank wall thickness this grommet can be used with? This grommet can be used with tank wall thicknesses up to 3/8" (9mm).
- Is the 3" uniseal grommet made in the usa? Yes, the 3" Uniseal Grommet is made in the USA.
- Do you have any installation tips for the 3" uniseal grommet? Measure twice before cutting your hole, and after cutting, smooth out any rough edges to ensure the best seal.
Need Fittings Installed on This Tank?
Use our free Custom RV Tank Builder — visually place fittings, get an instant price, and order with professional installation included.
100% Authentic OEM Parts
Factory-Fresh OEM Parts — the same brands installed in new RVs straight from Elkhart. Genuine, name-brand components made to order — never generic, never outdated. Sourced directly from the original RV manufacturers for perfect fit and factory-level quality.