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

🔧4-inch precision fit

♻️Durable plastic with galvanized screw

🛡️5 PSI max back pressure

€ 32.77

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Description

🔧 Seal it tight, seal it right — the pro’s choice for pressure-proof peace of mind!

TRUSTED TESTED - NSF listed and backed by 1,865+ five-star reviews for reliability
PRECISION 4 INCH SEAL - Engineered for a snug, leak-proof fit on most piping materials
VERSATILE APPLICATION - Ideal for temporary or permanent sealing, including toilet flange closures
DURABILITY MEETS DESIGN - Galvanized screw and wing nut combo ensures long-lasting, corrosion-resistant strength
PRESSURE READY PERFORMANCE - Handles up to 5 PSI air pressure on plastic pipes with confidence

The Oatey 33403 Plastic Plug is a 4-inch mechanical test plug designed for secure sealing of pipes with up to 5 PSI back pressure. Featuring a durable plastic body paired with a galvanized screw and wing nut, it offers corrosion resistance and a tight fit across various piping materials. NSF listed and highly rated by professionals, it’s perfect for plumbing tasks requiring reliable, temporary or permanent pipe sealing.

Specifications

ASIN	B000H5T1PI
Best Sellers Rank	#92,821 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #690 in Industrial Pipe Fittings
Brand Name	Oatey
Color	Red
Country of Publication	China
Customer Reviews	4.7 4.7 out of 5 stars (1,884)
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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€ 32.77

Duties & taxes included

In stock

Sold byAmazon SpainDelivered 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 Spain.

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Join PRO →

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TrustScore 4.5 | 7,300+ reviews

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