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, Red

Product ID: 72994482

Details

Brand
Oatey
Color
Red
Item Weight
0.5 Pounds
Material
Plastic
Product Dimensions
1.75"W x

🔧4-inch pipe fit precision

🧰ABS reinforced durability

🛡️17 PSI pressure rating

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AED 58

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Description

🚀 Seal it, test it, trust it — the pro’s choice for flawless pipe pressure testing!

BUILT TO LAST - ABS glass-reinforced plastic body resists rust and corrosion for reliable long-term use.
SECURE MECHANICAL GRIP - Designed to expand and seal pipe ends mechanically, preventing accidental plug falls into stacks.
UNMATCHED PRESSURE SEAL - Rated to hold up to 17 PSI or 40 ft. head pressure, ensuring leak-proof pipe testing every time.
CHEMICAL RESISTANT O RING - Natural rubber O-ring offers superior expansion and memory, maintaining a tight seal under pressure.
EFFORTLESS TOOL FREE INSTALLATION - Extra-large wing nut for quick, no-tool setup—get the job done faster and smarter.

The Oatey 33403 Plastic Plug is a 4-inch end-of-pipe mechanical gripper plug engineered for professional-grade pipe sealing and pressure testing. Featuring a durable ABS glass-reinforced body, a corrosion-resistant galvanized screw and wing nut, and a natural rubber O-ring, it reliably holds up to 17 PSI pressure. Designed for easy, tool-free installation and long-term use, this plug prevents leaks and accidental dislodging, making it a trusted solution for both residential and commercial plumbing applications.

Specifications

ASIN	B000H5T1PI
Best Sellers Rank	#3,798 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Expansion Plugs
Brand Name	Oatey
Color	Red
Customer Reviews	4.7 4.7 out of 5 stars (1,898)
Global Trade Identification Number	00038753334035
Included Components	(1) Mechanical plug
Item Dimensions W x H	1.75"W x 3.75"H
Item Type Name	4-in. End of Pipe Gripper Mechanical Plug with Galvanized Screw and Wing Nut
Item Weight	0.5 Pounds
Manufacturer	Oatey
Manufacturer Part Number	33403
Manufacturer Warranty Description	1 year limited.
Material Type	Plastic
Model Number	33403
Number of Items	1
UPC	038753334035
Unit Count	1.0 Count

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