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We are happy to offer the only drain box seal on the market that accepts multiple size pipes. After choosing your inlet/outlet holes and cutting them out, the seal is easy to install. Insert a key or other object through the tear tab in the middle of the seal, and tear along the lines to the size pipe you want to use. It is VERY important to NOT cut the seals. You can only tear the seals out to fit the pipe you will be using. Put the seal up to the hole from the inside of the box, and screw the nut onto the seal from the outside. Make sure the seal is facing the right side up if using anything smaller than 4”. Push the pipe through the seal, and you’re all set.