air hose coupling/universal coupling size: 1/4", 3/8", 1/2", 3/4", 1" male/female adaptor, hose end without/with collar air hose coupling/universal couplingsize: 1/4", 3/8", 1/2", 3/4", 1"male adaptor, female adaptor, hose end without/with collarUS type and Euro type