Rectangular Tube Inserts are ideal as rectangular end caps for tubing. Our extensive range of low density polyethylene rectangular tube end fittings are the ideal tube component to fit a wide variety of tube sizes. These rectangular end caps are designed to be inserted into hollow rectangular tube with our ribbed sides for a secure fitting to offer protection from sharp tube edges. Our tube caps come as black or white as standard, and other colours can be supplied by special order. We offer extensive stocks in imperial and metric sizes to suit a variety of tube wall thicknesses. For an ideal fit to neatly finish off your tubing, just measure both rectangular tube outside diameters and choose from our range. We carry thousands of each size of tube inserts in stock.