3/8" MNPT P style coupler bodies have 8 locking balls and a Buna-N Seal for better retention of plugs. P style couplers have a 3/8" basic flow size and a maximum of 300 PSI. Milton® P style couplers are made of heavy duty steel and offer air flow of 68 SCFM.
The P-style from Milton is equal to the commonly known "Automotive" style hose fittings. Please note that 1806 uses a 3/8" style body size which is larger than the standard 1/4" couplers