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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33403 Mechanical End-of-Pipe Gripper Plug, 4 in., Red

Product ID: 72994482

Details

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

📏Fits 4-inch pipe diameter precisely

🔧Tool-free installation with extra-large wing nut

🛠️Mechanical expansion for secure pipe sealing

$21.42

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Description

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

COMPACT YET DURABLE - Lightweight 8-ounce design with sturdy plastic and galvanized screw components built to last.
UNIVERSAL 4 INCH FIT - Precisely engineered to grip and seal standard 4-inch pipes, perfect for residential and commercial projects.
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 secure pipe pressure testing. With an extra-large wing nut for easy installation, durable plastic construction, and backed by over a century of Oatey plumbing expertise, this plug is a top-rated, reliable solution for both residential and commercial plumbing applications.

Specifications

ASIN	B000H5T1PI
Best Sellers Rank	#3,515 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 (1,945)
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
Number of Packs	1
UPC	038753334035
Unit Count	1 Count

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TrustScore 4.5 | 7,300+ reviews

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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$21.42

Duties & taxes included

In stock

Sold byAmazon USADelivered 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 USA.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

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Fantastic and great service. Shipping was faster than expected.

1 week ago

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