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The 3/4" Uniseal Grommet White (U075-W) by The Uniseal Warehouse is the trusted solution for creating a permanent, leak-proof connection between 3/4" PVC Schedule 40 pipe and your RV holding tank. No adhesives, no sealants — just a rock-solid compression seal that holds up season after season.
Features & Specifications
- Pipe ID (Inner Diameter): 3/4" (19mm)
- Pipe OD (Outer Diameter): 1.050" (27mm)
- Required Hole Saw Size: 1-1/4" (32mm)
- Maximum Wall Thickness: Up to 3/8" (9mm)
- Material: UV-Resistant Thermoplastic Elastomer
- Compatible Pipe: PVC Schedule 40
- Country of Origin: Made in USA
- Sold: Individually (Each)
Why Choose the U075-W Uniseal Grommet?
The 3/4" Uniseal Grommet U075-W uses a proven compression-seal design — push your PVC pipe through the grommet and it instantly forms a watertight seal without any glue, clamps, or sealant. The UV-resistant thermoplastic elastomer construction ensures long-term durability even in harsh outdoor RV environments.
Whether you're plumbing a fresh water tank, grey water tank, or black water holding tank, the U075-W Uniseal fitting delivers a professional-grade seal trusted by RV manufacturers and repair shops nationwide. With a perfect 5.0-star rating from verified buyers, it's the size most commonly used for standard RV tank vent and drain connections.
Compare Uniseal Grommet Sizes
Not sure which Uniseal size fits your pipe? Use this table to match your pipe's outer diameter to the correct grommet and hole saw size.
| Model | Pipe ID | Pipe OD | Hole Saw Size | Max Wall Thickness | Best For | View Details |
|---|---|---|---|---|---|---|
| U050-W | 1/2" (13mm) | 0.84" (21mm) | 1-1/4" (32mm) | 3/8" (9mm) | Small sensors, vents, low-flow connections | View U050-W |
| U075-W (This Product) | 3/4" (19mm) | 1.050" (27mm) | 1-1/4" (32mm) | 3/8" (9mm) | Standard RV tank vents, drains, fill lines | Current Page |
| U100-W | 1" (25mm) | 1.315" (33mm) | 1-3/4" (44mm) | 3/8" (9mm) | Larger drain/fill lines, high-flow applications | View U100-W |
| U150-W | 1-1/2" (38mm) | 1.900" (48mm) | 2-1/2" (64mm) | 3/8" (9mm) | Main tank drain connections, large-diameter plumbing | View U150-W |
| U200-W | 2" (50mm) | 2.375" (60mm) | 3" (76mm) | 3/8" (9mm) | Main fill/dump connections, large tank plumbing | View U200-W |
Tip: Always measure your pipe's outer diameter (OD) — not the nominal pipe size — to confirm the correct Uniseal grommet size before ordering.
Technical Specifications
- Part Number: U075-W
- Pipe Compatibility: PVC Schedule 40, 3/4" nominal pipe
- Pipe Inner Diameter: 3/4" (19mm)
- Pipe Outer Diameter: 1.050" (27mm)
- Required Hole Saw: 1-1/4" (32mm)
- Maximum Tank Wall Thickness: 3/8" (9mm)
- Color: White
- Material: UV-Resistant Thermoplastic Elastomer
- Installation Method: Compression seal — no adhesives required
- Origin: Made in USA
- Unit: Sold individually (Each)
What's Included
- One (1) 3/4" Uniseal Grommet — White (U075-W)
- Manufacturer warranty against defects
Compatible Models & Alternatives
Need a different pipe size? Browse the full Uniseal Grommet lineup: 1/2" U050-W, 1" U100-W, 1-1/2" U150-W, and 2" U200-W. Browse our full RV Tank Fittings collection for additional tank plumbing components.
Frequently Asked Questions
What hole saw size do I need for the U075-W Uniseal Grommet?
You'll need a 1-1/4" (32mm) hole saw to cut the correct opening in your tank for the U075-W grommet. After cutting, smooth any rough edges for the best seal.
Is the U075-W compatible with PVC Schedule 80 pipe?
The U075-W is designed and rated for PVC Schedule 40 pipe. Schedule 40 and Schedule 80 share the same outer diameter for 3/4" nominal pipe, but we recommend using it as specified with Schedule 40 for optimal sealing performance.
How do I install a 3/4" Uniseal grommet?
Cut a 1-1/4" hole in your tank wall, smooth the edges, insert the grommet into the hole, then push your 3/4" PVC pipe through the grommet. The compression seal forms automatically — no glue or sealant needed. Measure twice before cutting!
What is the maximum tank wall thickness for the U075-W?
The U075-W accommodates tank walls up to 3/8" (9mm) thick, which covers the vast majority of RV polyethylene holding tanks.
Can I use this grommet for both fresh water and waste water tanks?
Yes — the U075-W is suitable for fresh water, grey water, and black water holding tanks. The UV-resistant thermoplastic elastomer material is safe for potable water applications.
Where can I buy the U075-W Uniseal Grommet?
ElkhartRVParts.com is an authorized retailer of The Uniseal Warehouse products. Order directly here for guaranteed authentic parts with fast shipping.
Why Buy from Elkhart RV Parts?
We are an authorized dealer of The Uniseal Warehouse, meaning every U075-W grommet you purchase from us is 100% genuine OEM-grade. We stock authentic parts, ship fast, and back every order with our 30-day return policy. Our team knows RV plumbing — we're here to make sure you get the right part the first time.
| Color | White |
|---|---|
| Hole saw size (inches) | 1.25 |
| Hole saw size (millimeters) | 32 |
| Pipe inner diameter (inches) | 0.75 |
| Pipe outer diameter (inches) | 1.05 |
| Maximum wall thickness (inches) | 0.375 |
| Pipe inner diameter (millimeters) | 19 |
| Pipe outer diameter (millimeters) | 27 |
| Maximum wall thickness (millimeters) | 9 |
- What pipe size does the 3/4" uniseal grommet fit? The grommet fits a 3/4" (19mm) inner diameter pipe and a 1.050" (27mm) outer diameter pipe.
- What thickness of tank wall can this uniseal grommet accommodate? It can accommodate tank walls up to 3/8" (9mm) thick.
- What size hole do i need to cut for installing this grommet? You need to cut a 1 1/4" (32mm) hole for proper installation of the grommet.
- Is this grommet compatible with pvc schedule 40 pipes? Yes, this grommet is designed to connect PVC Schedule 40 pipes to your tank.
- Where is the 3/4" uniseal grommet manufactured? This grommet is made in the USA.
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.