RBS has found this to be a real problem solver when trying to fine tune your hi-speed check valve on your fuel system. To change pressure simply take 1/4" allen wrench stick in the valve and turn right to raise or left to lower. One flat of the allen wrench is approx. three pounds.
Includes detailed instructions and a couple spare O-rings. List below gives a range of pressures on the check valves that the racer gets to choose from. 2-25# 10-45# 40-90# 60-160#
The check body is made from billet alum. so it is lightweight and the housing is anodized to protect from corrosion.