1/4 MNPT T style couplers have a brass body and a Buna-N seal. Milton T style couplers have a 1/4 basic flow size and a maximum of 300 PSI. Offers air flow of up to 40 SCFM. Product Features:1/4 male national pipe threadMaximum of 300 pounds per square inchAir flow of 40 standard cubic feet per minuteMaximum temperature of 250 degrees Fahrenheit