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 4 in. Mechanical End-of-Pipe Gripper Plug - 1 Each

Oatey 4 in. Mechanical End-of-Pipe Gripper Plug - 1 Each

Product ID: 72994482

Details

Brand
Oatey
Color
Red
Item Weight
8 ounces
Material
Plastic
Product Dimensions
1.75"W x

📏Fits 4-inch pipe ends perfectly

🔧Tool-free install with oversized wing nut

🛠️Mechanical expansion for secure pipe sealing

€ 24.81

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔩 Seal it like a pro—no tools, no stress, just flawless pipe testing!

DURABLE CONSTRUCTION - Made with high-quality plastic and galvanized screw for long-lasting performance under pressure.
COMPACT LIGHTWEIGHT - At just 8 ounces and 3.75 inches tall, it’s easy to handle and store on any job site.
RELIABLE PRESSURE HOLD - Mechanical expansion grips pipe ends tightly, ensuring leak-proof pressure testing every time.
EFFORTLESS INSTALLATION - Oversized wing nut lets you seal pipes without any tools—speed up your workflow and skip the hassle.
TRUSTED INDUSTRY STANDARD - Backed by Oatey’s 100+ years of plumbing expertise and a 4.7-star rating from nearly 2,000 pros.

The Oatey 4-inch Mechanical End-of-Pipe Gripper Plug is a professional-grade plumbing tool designed for quick, tool-free installation and reliable pressure sealing during pipe testing. Featuring a large wing nut for easy hand-tightening and a mechanical expansion mechanism, it securely grips pipe ends to prevent leaks. Trusted by plumbing experts for over a century, this lightweight, durable plug is a top-rated choice for both residential and commercial applications.

Specifications

ASIN	B000H5T1PI
Best Sellers Rank	#3,424 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 (1,914)
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	8 ounces
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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€ 24.81

Duties & taxes included

In stock

Sold byAmazon BelgiumDelivered 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 Belgium.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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Good experience, but the tracking updates could be better.

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