This 2 LB Check Valve is Anodized blue and Has a Directional Arrow to Show Flow direction
Residual Check Valves Are Needed When Using an Adjustable Proportional. 2lb Check Valve for Disc Brakes and 10 LB Check Valve For Drum Brakes.
Valve. Note: Proportional Kits (with bracket) Will Not Work With Wilwood Master Cyl.