I bought these on purpose because they came with a 4" drain pipe plug. In fact, they are more expensive than Home Depot ones. are extremely cheap and connections are usually not available. The end cap design sucks, doesn't fit properly on the 4" flex pipe - I had to glue that and put tape on it. I could do something similar with the HDs that didn't have a proper stub. the only reason I bought them instead. The end cap itself does NOT snap either - it needs to be glued - which doesn't hold well and adds a day to your prep just for this step. The connections are very small and weak. 1/3 of them broke out of the box, the rest almost all broke trying to align everything and wobbling a little along the entire length. Garbage. As someone else said, there aren't many ridges on the underside for the concrete to bond to. Overall very poor quality and difficult to assemble. It takes a lot of silicone and tape to hold things together and make them look less professional. The ones at the hardware store seemed much better and cheaper. If you don't mind installing your own end cap or using a floor drain, I would highly recommend another brand instead.
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