--- product_id: 270164774 title: "Oatey 33403 Plastic Plug (with Galvanized screw and wing nut), 4-Inch" brand: "oatey" price: "10.26 OMR" currency: OMR in_stock: true reviews_count: 6 category: "Oatey" url: https://www.desertcart.com.om/products/270164774-oatey-33403-plastic-plug-with-galvanized-screw-and-wing-nut store_origin: OM region: Oman --- # 4-inch precision fit Durable plastic with galvanized screw 5 PSI max back pressure Oatey 33403 Plastic Plug (with Galvanized screw and wing nut), 4-Inch **Brand:** oatey **Price:** 10.26 OMR **Availability:** βœ… In Stock ## Summary > πŸ”§ Seal it tight, seal it right β€” the pro’s choice for pressure-proof peace of mind! ## Quick Answers - **What is this?** Oatey 33403 Plastic Plug (with Galvanized screw and wing nut), 4-Inch by oatey - **How much does it cost?** 10.26 OMR with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/270164774-oatey-33403-plastic-plug-with-galvanized-screw-and-wing-nut) ## Best For - oatey enthusiasts ## Why This Product - Trusted oatey brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Trusted & Tested:** NSF listed and backed by 1,865+ five-star reviews for reliability - β€’ **Precision 4-Inch Seal:** Engineered for a snug, leak-proof fit on most piping materials - β€’ **Versatile Application:** Ideal for temporary or permanent sealing, including toilet flange closures - β€’ **Durability Meets Design:** Galvanized screw and wing nut combo ensures long-lasting, corrosion-resistant strength - β€’ **Pressure-Ready Performance:** Handles up to 5 PSI air pressure on plastic pipes with confidence ## Overview 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. ## Description Oatey Test Plug, Mechanical, 4 in Nominal, 5 psi Back Pressure, Plastic, Red, 110 deg F, NSF Listed. . Review: Fantastic - Only hope is it lasts forever. If the wing nut design could have been changed to be flush with the floor, it would be an added advantage Review: Perfect fit - Bought this to seal off a toilet flange that we are no longer needing. This toilet flange was too hard to remove and at some point we may want to reinstall the toilet. The 4 inch sized one works perfect. A nice tight seal. ## Features - Plastic mechanical plugs have a wide usage range making them effective on most piping material - Maximum allowed air is 5 PSIG on plastic and 2 PSIG on galvanized - Plastic mechanical plugs are premium plugs designed to hold higher pressures ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000H5T1PI | | Best Sellers Rank | #80,868 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #555 in Industrial Pipe Fittings | | Brand | Oatey | | Brand Name | Oatey | | Color | Red | | Colour | Red | | Customer Reviews | 4.7 out of 5 stars 1,865 Reviews | | 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 | 0.5 Pounds | | Item weight | 0.5 Pounds | | Manufacturer | Oatey | | Manufacturer Part Number | 33403 | | Material | Plastic | | Material Type | Plastic | | Model Number | 33403 | | Number of Items | 1 | | Product dimensions | 44W x 95H millimeters | | UPC | 038753334035 | | Unit Count | 1.0 Count | ## Product Details - **Brand:** Oatey - **Colour:** Red - **Item weight:** 227 g - **Material:** Plastic - **Product dimensions:** 44W x 95H millimeters ## Images ![Oatey 33403 Plastic Plug (with Galvanized screw and wing nut), 4-Inch - Image 1](https://m.media-amazon.com/images/I/61n+a7FAwRL.jpg) ![Oatey 33403 Plastic Plug (with Galvanized screw and wing nut), 4-Inch - Image 2](https://m.media-amazon.com/images/I/81FwDIsRb5L.jpg) ![Oatey 33403 Plastic Plug (with Galvanized screw and wing nut), 4-Inch - Image 3](https://m.media-amazon.com/images/I/717EZzqgBcL.jpg) ## Questions & Answers **Q: What size is the bolt and how long is it? Thanks.** A: 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. **Q: Would this stand up to the abuse of an ATV, as a dry storage tube cap?** A: I would think so. It’s pretty sturdy **Q: Will this seal the 31/4" cleanout hole in 4" cast iron sewer line?** A: 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. **Q: 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?** A: 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. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Fantastic *by N***O on 13 October 2024* Only hope is it lasts forever. If the wing nut design could have been changed to be flush with the floor, it would be an added advantage ### ⭐⭐⭐⭐⭐ Perfect fit *by J***S on 20 March 2021* Bought this to seal off a toilet flange that we are no longer needing. This toilet flange was too hard to remove and at some point we may want to reinstall the toilet. The 4 inch sized one works perfect. A nice tight seal. ### ⭐⭐⭐⭐ Slightly overpriced *by H***. on 19 June 2025* Good product, but slightly overpriced ## Frequently Bought Together - Oatey 33403 4-in. End of Pipe Gripper Mechanical Plug with Galvanized Screw and Wing Nut, 4 Inch, Red - Oatey 33402 Mechanical Test Plug, 3 in, 5 Psi Back, Plastic, 110 Deg F, 3 Inch, Red - Oatey 33400 Mechanical End-of-Pipe Gripper Plug, 1-1/2 in., Red, 1 Count --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.om/products/270164774-oatey-33403-plastic-plug-with-galvanized-screw-and-wing-nut](https://www.desertcart.com.om/products/270164774-oatey-33403-plastic-plug-with-galvanized-screw-and-wing-nut) --- *Product available on Desertcart Oman* *Store origin: OM* *Last updated: 2026-08-04*