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!

COST LABOR SAVER - Single-piece design slashes assembly time and material costs.
EFFORTLESS INSTALLATION - Cut, insert, and seal in minutes—no tools or extra parts needed.
VERSATILE COMPATIBILITY - Fits tanks up to 3/8” wall thickness for broad application.
UNMATCHED SEAL INTEGRITY - Du Pont Alcryn material ensures a liquid-tight seal up to 65 PSI.
DURABLE CHEMICAL RESISTANT - Withstands acids, oils, gasoline, and extreme temperatures.

The 2" UNISEAL Flexible Tank Adapter is a premium, USA-made rubber seal designed for quick, tool-free installation. Its innovative Du Pont Alcryn material creates a superior liquid-tight seal up to 65 PSI, compatible with tanks up to 3/8" wall thickness. Resistant to chemicals, heat, and cold, this 2-pack adapter streamlines plumbing connections by replacing complex hardware with a single injection-molded unit, reducing labor and costs for professionals who demand reliability and efficiency.

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Size	Small
Material	Rubber
Brand	GREEN GOODS
Colour	Black
Connector Type	Adapter
Thread Size	2 inch
Thread Type	NPT
Number of Pieces	2
Manufacturer	The Uniseal Warehouse
UPC	637262982579
Item model number	ikjnlk-958
Package Dimensions	20.3 x 9.1 x 1.9 cm; 105 g
ASIN	B072QR9KR6

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

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