Homesmiths PVC Bottle Trap 1-1/2 InchThis Bottle Trap is a simple to deal with and utilize plumbing installation under your kitchen and wash bowl sinks. It traps unwanted waste that has exited from the sink and keeps it from framing an obstruction inside the pipes framework and prevents sewer gases from going into your home. Aside from stopping sewer gases, creepy crawlies and cockroaches can at times be harmful are prevented from entering through waste lines, thanks to the bottle trap..