What size is the bolt and how long is it? Thanks.

I measured the bolt at 3/8" threaded diameter with 2 1/4" of threaded length. Since this is not specified in the description and other bolt lengths would work the same, it may be you'd end up with a different bolt length.

Would this stand up to the abuse of an ATV, as a dry storage tube cap?

I would think so. It’s pretty sturdy

Will this seal the 31/4" cleanout hole in 4" cast iron sewer line?

This plug properly fits a 4" hole. Mine is in use so I cannot measure it. However, I also purchased the 3" plug and I believe it would be more appropriate. At max, it achieves about 3 1/8 seal. If you wrap enough material around the 3" you might get a more usable product.

End of RV slinky storage tube is 4.5 " diameter. When rubber is compressed will this be tight enough to survive vibration of normal travel?

It's meant to hold fast in a firm pipe, like PVC. I wouldn't recommend it for a hose or pipe with give. The rubber gasket only moves out a little bit when tightened. Maybe you could get a large hose clamp and tighten it down outside your hose after you cover the end with aluminum foil.

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Oatey 33403 Plastic Plug (with Galvanized screw and wing nut), 4-Inch

Product ID: 270164774

Details

Brand
Oatey
Colour
Red
Item weight
227 g
Material
Plastic
Product dimensions
44W x 95H

🔥110°F heat resistance

🔧4-inch precision fit

🛡️5 PSI max back pressure

$U1683

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Description

🛠️ Plug into reliability and never miss a pressure test!

PRECISION 4 INCH FIT - Engineered for a secure seal on most pipe materials, ensuring leak-proof confidence.
PREMIUM PRESSURE HOLD - Rated for up to 5 PSI on plastic pipes, perfect for demanding mechanical tests.
EFFORTLESS INSTALLATION - Includes galvanized screw and wing nut for quick, tool-free setup—get the job done faster.
HEAT RESISTANT DURABILITY - Withstands temperatures up to 110°F, built to last in tough environments.
TRUSTED INDUSTRY STANDARD - NSF listed and top-ranked in industrial pipe fittings for reliable performance.

The Oatey 33403 Plastic Mechanical Test Plug is a 4-inch, NSF-listed plumbing essential designed to hold up to 5 PSI back pressure on plastic pipes. Featuring a durable plastic body with galvanized screw and wing nut for easy installation, it withstands temperatures up to 110°F. Highly rated and trusted in industrial pipe fittings, it’s the go-to choice for professionals demanding secure, leak-proof testing.

Specifications

ASIN	B000H5T1PI
Best Sellers Rank	#17,363 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #100 in Industrial Pipe Fittings
Brand Name	Oatey
Color	Red
Country of Publication	China
Customer Reviews	4.7 4.7 out of 5 stars (1,898)
Global Trade Identification Number	00038753334035
Included Components	Electrical & Heating;Cord & Power Management;electric-plugs
Item Dimensions W x H	44W x 95H millimeters
Item Type Name	Mechanical Test Plug, 4 In, 5 Psi Back, Plastic, 110 Deg F
Item Weight	227 g
Manufacturer	Oatey
Manufacturer Part Number	33403
Material Type	Plastic
Model Number	33403
Number of Items	1
Number of Packs	1
UPC	038753334035
Unit Count	1.0 Count

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$U1683

Duties & taxes included

In stock

Sold byAmazon UruguayDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Uruguay.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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