Milton (S-716) 1/4" MNPT Male M-Style KWIK-CHANGEr CouplerMilton Industries is proud to be the creator and leader of the pneumatic industry standard M-Style coupler. Both the body and sleeve are made of brass.You can also find this S-716 air coupler included in these Milton coupler/plug and accessory kits: #S-221, S-222, MK1669-1, 683-MCPK.