3" UNISEAL Flexible Tank Adapter (Bulkhead) - 2 Pack

I like these products for hydroponics. Be very careful to measure the outside diameter of hole saw. I first used a Lenox 4" saw. The seal leaked. Measured saw it was 4 1/8". Went to another on the shelf and it was exactly 4" no leaks. Good product.

Summary: Using these 3-inch uniseal for an extra large rain barrel over flow. These are perfect in this application, instead of installing a bulkhead connector, which is more expensive, and much heavier.Pros: Good fit & finish; rubber is pliable but firm.Cons: None.Conclusion: At $12 for 2, rating these 5-stars.

Holy smokes it was hard putting the pvc through it, but once you get it in, it is really water tight. Used it on a blue barrel settlement tank that moves 3000gl every hour. Not a bit of leaking. Great purchase and product.

Seems to work fine now but a serious pain to install.Used this on 3 inch schedule 40 pvc inlet pipe on a rainwater storage tank. Used the specified 4 inch hole saw, debured the opening and all that.The gasket was hard to slide over the (soap water lubricated) pipe off the tank. With the gasket installed in the tank there was no way to get the pipe inserted. Just no way.After seriously beveling and tapering the end of the pipe, beveling the inner edge of the hole in the tank a bit, soaking the gasket in hot water for a while to soften it up, using Vasaline and soapy water to lubricate things, two of us were finally able to horse the pipe into the tank.No instructions provided. Thank goodness for YouTube for ideas of how to make it possible.

I wish I'd known about uniseals years ago. The plumbing into diy bio filters was so much easier! They are a tight fit, but that makes for a good seal. Absolutely no leakage. I did file a bevel on ends of pvc and abs and used some dawn dish soap to help push pipes through the uniseal. i also found putting the seal in warm to hot water first helped a lot.

Super hard to get the pipe in

Works well

Not impressed. Was harder to use then was worth the money of buying the more expensive bulkhead fittings. Had a hard time trying and with what I was working with it would not work again not impressed and not happy. I thought for the price it would be just right but boy was I wrong.

good bulkhead seals. working great.