Just making absolutely sure - my cleanout hole diameter is 3.5" with no threads. This will fit and tighten up?

yes, this should work for a cleanout hole that is exactly 3.5" in diameter. it holds max head pressure of 50 ft.

Will this fit a 3 1/4 opening?

Probably yes. The measurements of cleanouts can be deceptive. Mine also measured 3-1/4 and yet a 3-1/2 metal fit-all plug worked just fine. So give it a try.

Is this safe for drinking water applications?

Item was used for sewar pipe cleanout. I dont think its intended for drinking water applications.

Is the seal waterproof?

Yes it is waterproof. Essentially it is a pvc part and a rubber part. Tightening it will seal any liquids or smells from escaping from opening. Also because of the materials, in future will make for easy removal and/or replacement.

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G.T. Water Products, Inc. MTP352 Safe-T-Seal Combination Cleanout Plug, 3-1/2-Inch

Product ID: 637343769

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Details

Material
Rubber
Brand
SAFE-T-SEAL
Colour
Blue
UPC
077115352003
Global Trade Identification Number

💧50-ft head pressure tested

🛠️3.5-inch versatile fit

🇺🇸Made in USA quality

Description

🔧 Seal the deal with confidence—no rust, no fuss!

RUST FREE DURABILITY - All-rubber design means zero metal parts to corrode or fail.
ECONOMICAL REUSABLE - Cost-effective solution that you can rely on again and again.
PROUDLY AMERICAN MADE - Crafted in the USA for trusted quality and performance.
EFFORTLESS INSTALLATION - Quick, tool-free setup and removal saves you time and hassle.
PRESSURE PROVEN RELIABILITY - Withstands up to 50 feet of head pressure—tested through 3 stories.

The G.T. Water Products MTP352 Safe-T-Seal is a 3.5-inch combination cleanout plug made from durable rubber, designed for easy installation and removal. It offers a positive, rust-free seal and is pressure-tested up to 50 feet, ensuring reliable performance. Proudly manufactured in the USA, it’s an economical, reusable solution for professional-grade plumbing needs.

Specifications

Material	Rubber
Brand	SAFE-T-SEAL
Colour	Blue
UPC	077115352003
Global Trade Identification Number	00077115352003
Number of Items	1
Manufacturer	G.T. Water Products, Inc.
Country of Origin	USA
Item model number	GT Water Products - MTP352
Product Dimensions	8.89 x 8.89 x 5.08 cm; 159 g
ASIN	B0055NN6GM

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