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.
Milton M-Style Kwik Change couplers are made of brass, while M-Style Kwik Change plugs are made of case-hardened steel and are plated to resist rust. This collection of couplers and plugs: Will interchange with all manufacturers who comply with the dimensional requirements of military specification MIL-C-4109; Offer a maximum airflow of 40 standard cubic feet per minute (except for select Push Button options); Offer a maximum of 300 pounds per square inch; Can withstand a max temperature of 250 degrees Fahrenheit.
Milton (S-716) 1/4" MNPT Male M-Style KWIK-CHANGE® Coupler. Milton Industries is proud to be the creator and leader of the pneumatic industry standard M-Style coupler. This 1/4" MNPT M style brass coupler has a 1/4" basic flow size, offering a maximum of 300 PSI. Comes with Buna-N seal and air flow of 40 SCFM. Both the body and sleeve are made of brass.