This seals the end of a piece of "100mmx50mm" (which is a metric approximation) rectangular downpipe, closing the ends for a hydroponic run. It is parametric and can be rescaled to suit larger pipes, or indeed anything with a rounded rectangle profile that needs plugging!Make sure they fit. Print one for each end. Cut square & clean ends of the pipe. Squirt silicone sealant, epoxy or similar into the groove on the endpiece. Mallet onto the end of the pipe and leave for adhesive to set. If it leaks, dry it and varnish it.These endpieces were printed in Ivory PLA from Diamond Age Solutions Ltd. on a Simplified Kiwi Mendel.