This item is for a pair of 'O' ring suitable for the Triumph and BSA triple, T150, T150v, T160 and A75.  It has a diameter of 2".

OEM part numbers: 70-6570, E6570

This item is made from Nitrile and is the most cost effective and commonly available O-ring material.  Ideal for use as seals for pumps, drive belts, and other general engineering applications in the hydraulic and pneumatic industry. NBR is good for applications where the 'O' ring is exposed to fats, greases and animal or vegetable oils (see spec sheet). 

N.B. ONLY the 'O' ring is included in this sale and NOT the oil pump.