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🔧 Seal it tight, seal it right — the pro’s choice for pressure-proof peace of mind!
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.

| 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 |
N**O
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
J**S
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.
H**.
Slightly overpriced
Good product, but slightly overpriced
M**E
Perfect Solution for Capping an Unused Toilet Drain - Sealed Tight and Installed in Seconds
I purchased this Oatey 4-inch test plug to cap the drain after removing a toilet from an unused half bath that we're converting into a linen closet. After removing the toilet, I discovered the existing toilet flange was offset rather than centered. My initial concern was that the plug might not fit properly or create a reliable seal. Fortunately, those concerns disappeared as soon as I installed it. The plug fit perfectly into the flange, and with just a few turns of the wing nut, the rubber expanded securely against the pipe walls and created a tight, solid seal. Installation took only a couple of seconds and required no special tools. The construction appears robust, with a sturdy plastic body, galvanized hardware, and a thick rubber sealing surface. Once tightened, it remained firmly in place without any movement. Most importantly, it completely sealed the drain and eliminated any concern about sewer gases entering the room. For anyone repurposing a bathroom, remodeling, or temporarily removing a toilet, this is a simple and effective solution. Overall, this is one of those products that does exactly what it's designed to do. It's well made, easy to install, provides an excellent seal, and gives peace of mind that the drain is properly capped. Highly recommended.
S**E
Buena calidad
Cumple para lo que fue echo
A**R
Great for my basketball base seal!
Used it to create a seal in my portable basketball net. The design was flawed to fit sand, so I cut the back and used this to create a watertight seal. Works great!
Trustpilot
2 weeks ago
1 month ago