... :2" thru 4-1/16" API 6A demco mud valve API Series mud valve deliver reliable performance in heavy duty oilfield applications ... from pipeline. Soft seal mud valve featuresAll parts are interchangeable with DEMCO gate valve manufactured by Cameron.The bonnet is easily removed ... , crosses ,flange adapter,etc)2) Valve (FC/FLS gate valve, mud gate valve, chock valve, etc)3) Fitting(union, manifold,elbows ...