A style couplers are push type automatic. A style couplers are made of heavy-duty steel. Maximum inlet pressure of 300 PSI. Maximum working pressure of 250 PSI. Maximum temperature of 250 degree F. Air flow of 34 SCFM. Seals are Buna-N. Locking balls (where applicable) are stainless steel. Warning: Couplers in this section are for use with shop air only.