Cim-Tek 300 series 50003 cast iron spin-on filter head 3/4 inch NPT(F) side portsCim Tek 300 series 50003 cast iron spin on filter head 3 4 inch NPT(F) side ports Cast iron mounting spin on filter adaptor 200, 250, 260, 300 series Nose thread 1 inch For use with the following Cim Tek filters: 70002,70046, 70819,70003, 70094, 70095, 70230, 70234, 70062, 70067, 70232, 70236, 70806, 70010, 70012, 70057, 70058, 70122, 70018, 70059, 70064