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🔧 Seal it tight, seal it right — the pro’s choice for flawless pipe plugs!
The Oatey 33403 Plastic Plug is a 4-inch mechanical test plug designed for secure sealing of pipes with a maximum back pressure of 5 PSI. Made from durable plastic and featuring a galvanized screw with a wing nut, it offers easy installation and reliable performance up to 110°F. NSF listed and highly rated by professionals, it’s the go-to solution for plumbing pros seeking a tight, reusable seal.

| ASIN | B000H5T1PI |
| Best Sellers Rank | #80,865 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #544 in Industrial Pipe Fittings |
| Brand | Oatey |
| Brand Name | Oatey |
| Color | Red |
| Colour | Red |
| Customer Reviews | 4.7 out of 5 stars 1,866 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 | 227 g |
| Item weight | 227 g |
| 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 days ago
4 days ago