Thd Closure, 4-8un

Thread Closure 4-8un

Tank Closure / Cap, MC4821-1, also called SF4821-1, is 4″ x # 8 UN female Thread and Includes O-ring ( 3413575 ). Commercial Tanks ( 14″, 16″, 18″ 20″, 21″, 22″, and 24″ ) are the only ones with 4″ threaded opening. Used primarily on manual filter tanks that have side piping for inlet and outlet.