Proflow keeps your pressures in check with this adjustable bypass. This adjustable bypass Hose End lets you set the bypass to recirculate excess fuel back into your tank when pressures reach a defined point - to prevent excessive pressure through your fuel system or carburettor. Adjustable between 18 and 35 psi, the AN8 Hose Ends install easily and allow you to keep your fuel pressure at an optimal level without spiking.