Mechanical Seal, Cleanout Pipe Plug, Expansion Rubber Scupper Plugs 1-1/2 to 1-3/4 in Sewer Cover Caps Winterizing Boat Handle Drain Plug with Galvanized Screw and Nut for Pipe Sink Pool

Works well. Make sure you screw it in so it’s a little tight before installing so it won’t spin. Otherwise, blocks smell from entering RV while travelling.

I have an uncapped cast iron drain line that would mean thousands to replace with PVC, this product is the ONLY one that fit - and it did so in seconds. I can't tell you how many bad fixes I went through before landing on this one. For the product managers reading the reviews, consider making them in other colors, the blue handle, in my instance, draws unwanted attention.

Im using this as a replacement sewer drain cover in my unfinished basement. The original threaded connection has rusted out so the original cover no longer does the job. The basement had a sewer gas smell which I had been trying to block with diy methods. Save yourself time and energy, this plug does the job correctly. The sewer smell is gone.

Plugged that hole up good!

Great Seal, Fit, Quality, and Value. Highly Recommend.

Worked great!

But issue is it only works on a couple size pipes. No good for a bathtub overfill no good for anything to do with the kitchen.

The M10 locking nut on the very bottom is not stainless. Covered in rust after one winter with my pool line