Compressor Attributes: Type..(HS18)..... Pulley Grooves..(8)..... Pulley Diameter..(4.31'')..... Mount Dist. to 1st Groove..(0.85'')..... Comp. Mount..(Tangent)..... Manifold..(Sealing Washer) Here at Comfort Auto every single compressor are tested, measured and inspected in house to ensure all compressor meet or exceed industry standards. That way our customers will receive a perfectly working compressor on the first shipment.