Mounting (4): Horizontal - 1/4" - 20 well nuts in bodyTrailer Delivery: 1/4"Reservoirs (2): 1/4"Exhaust: 1/4"Tractor Delivery: 1/4"Auxiliary Supply: 1/4"OEM Part Number: N4400EH - N4400B
Engineering Grade Composite (EGC) - One Piece Housing. Ports have molded identification.