I have a hole that's exactly 55mm. Is there a bit of leeway for the maximum expansion such that the 45-55mm plug can securely seal this opening?

Hello, 45-55mm is fine, it can meet your blocking needs.

I am looking for pressure at 1.1 bar or 15 psi. Will this do it?

Hi,dear this rubber expansion plug's maximum working pressure is 1bar/1Mpa, hope this helpful

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Sponsored Ad - Mechanical Test, Seal & Clean-Out Pipe Plug - 1-7/8 to 2-1/4 in Marine Boat Scupper Steel DWV Testing Anti-Return Winterizing Pool Plug with Galvanized Screw & Nut for Most Pipe Sink Pool

Sponsored Ad - Mechanical Test, Seal & Clean-Out Pipe Plug - 1-7/8 to 2-1/4 in Marine Boat Scupper Steel DWV Testing Anti-Return Winterizing Pool Plug with Galvanized Screw & Nut for Most Pipe Sink Pool

Product ID: 469713563

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Details

Material
Stainless
Brand
BOPOREAE
Color
Blue
Number of Items
1

🔩Adjustable fit 1.75-2.25 in

⚙️Durable stainless steel & NBR

🛡️Leakproof airtight seal

Description

🔧 Seal it, test it, forget leaks—plug in peace of mind!

LEAKPROOF CONFIDENCE - Expands securely inside pipes to create a 100% airtight, leakproof barrier for testing and winterizing.
QUICK INSTALL REMOVE - Turn the T-handle clockwise to seal, counterclockwise to release—fast, reliable, and reusable.
UNIVERSAL FIT ZERO HASSLE - Fits 1.75 to 2.25-inch pipes with effortless twist-to-seal action—no tools needed.
BUILT TO BRAVE THE ELEMENTS - Premium stainless steel and NBR rubber resist heat, rust, oil, and freeze—perfect for marine and outdoor use.
VERSATILE APPLICATION POWERHOUSE - Ideal for everything from boat scuppers and pool skimmers to kitchen drains and automotive systems.

The BOPOREAE Mechanical Test, Seal & Clean-Out Pipe Plug is a robust, adjustable pipe plug designed for 1.75 to 2.25-inch openings. Crafted from stainless steel and nitrile butadiene rubber, it offers a durable, leakproof seal resistant to heat, rust, oil, and freezing conditions. Perfect for marine, pool, automotive, and household drainage applications, it installs easily without tools and ensures reliable low-pressure testing and winterizing.

Specifications

Material Type

Stainless Steel, Rubber

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$U2157

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