Comparison : Item # 21BF4M, Bulkhead Coupling Medium Pressure Fittings
Item # 21BF6M, Bulkhead Coupling Medium Pressure Fittings
Item # 21BF9M, Bulkhead Coupling Medium Pressure Fittings
Item # 21BF12M, Bulkhead Coupling Medium Pressure Fittings
Item # 21BF16M, Bulkhead Coupling Medium Pressure Fittings