This coupler is made from billet heat treated steel and is used with the 1.430" dia. twenty eight spline shaft blower snouts. Works with PSI roots blower snouts only.
Racer must specify fuel or hi-helix type blower when ordering in the blower type box. Coupler length in drop down menu is referring to the length of the blower snout that the racer is installing the coupler onto.
Racer can choose snout coupler length from drop down menu.