Features: 1.Made of billet aluminum with a hard anodized finish to cope with the extreme conditions in the engine bay while maintaining great looks. 2.Hard anodized finish 3.AN6 1/8×2 / #8 STRAIGHT 1/8NPT×2 FITTINGS 4.Diaphragm diameter: 33 5.Vacuum hose nipple: 4.5 6.Part number: 185001