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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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 installation with extra-large wing nut

🛠️Mechanical expansion for secure pipe sealing

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Description

🔴 Seal it, test it, trust it — the pro’s choice for flawless pipe endings!

DURABLE SUPPORTED - Made from high-quality plastic with a 1-year limited warranty and top-tier customer support.
COMPACT LIGHTWEIGHT - At just 8 ounces and 1.75" x 3.75", it’s easy to handle and store—perfect for on-the-go professionals.
RELIABLE MECHANICAL SEAL - Expands mechanically to create a pressure-tight seal, ensuring your pipe testing is flawless and leak-free.
TRUSTED INDUSTRY STANDARD - Backed by Oatey’s 100+ years of plumbing expertise and a 4.7-star rating from nearly 2,000 pros.
EFFORTLESS TOOL FREE SETUP - Extra-large wing nut lets you install quickly without any tools—save time and hassle on every job.

The Oatey 4-inch Mechanical End-of-Pipe Gripper Plug offers a tool-free, mechanically expanding seal designed for efficient and reliable pipe pressure testing. Lightweight and compact, it fits standard 4-inch pipes and is backed by over a century of plumbing expertise, a strong customer rating, and a 1-year warranty—making it an essential tool for plumbing professionals seeking speed, reliability, and peace of mind.

Specifications

ASIN	B000H5T1PI
Best Sellers Rank	#3,826 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 (1,900)
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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