Morrill Industries, Inc. stocks a large selection of Butt Weld fittings for a standardized method of designing and planning your piping system. We offer a Butt Weld Cap in many different sizes, in which you can call us for a custom size. A Butt Weld Cap is used to shut down the end of a pipe. Items are available in Carbon Steel, 304/304L, & 316/316L Stainless Steel.