What size hole is needed to be drilled for the 2 inch Uniseal?

The 2 inch uniseal requires a 3 inch hole

This is supposed to create a watertight, but if I use this on a sump pump to prevent sewer gas from escaping, should I also use a sealant?

These work great. No extra sealant needed. Used mine on holding tank in boat. Perfect seal.

Would a 73mm (2-7/8") Hole Saw hole work for the 2" to 3" uniseal? (3" seems too loose)?

the pipe will force the seal into the 3" hole...try pushing the pipe in then see if you think its loose...use the hole size they recommend

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🔧 Seal smarter, not harder — the ultimate flexible tank adapter for pros who demand perfection.

PROUDLY AMERICAN MADE - Crafted in the USA, ensuring premium quality and supporting local manufacturing excellence.
UNIVERSAL COMPATIBILITY - Fits pipes with 2" ID and up to 3/8" wall thickness, perfect for diverse industrial and DIY projects.
STREAMLINED INSTALLATION - Single-piece design replaces complex hardware—cut, insert, and push for a flawless fit in minutes.
EFFORTLESS LEAK PROOF SEAL - Innovative Alcryn material forms a liquid-tight barrier up to 65 PSI, eliminating leaks and costly repairs.
DURABILITY MEETS VERSATILITY - Resistant to acids, oils, gasoline, and extreme temperatures—built to last in any environment.

The 2" UNISEAL Flexible Tank Adapter is a high-performance, single-piece bulkhead seal made from durable Alcryn material. Designed for quick, tool-free installation, it fits 2" ID pipes with up to 3/8" wall thickness and requires only a 3" holesaw cut. Engineered in the USA, it provides a reliable, liquid-tight seal up to 65 PSI, resistant to harsh chemicals and temperature extremes, making it the go-to solution for professional-grade plumbing and tank connections.

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Manufacturer	The Uniseal Warehouse
Part Number	ikjnlk-958
Package Dimensions	20.3 x 9.1 x 1.9 cm; 105 g
Item model number	ikjnlk-958
Colour	Black
Material	Alcryn
Item Package Quantity	1
Number of Pieces	2
Batteries included?	No
Batteries Required?	No
Item Weight	105 g

2" UNISEAL Flexible Tank Adapter (Bulkhead) - 2 Pack

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