SPD V2 are the latest check valves. These check valves come with a completely new construction that differs from all others on the market where the check valve is completely sealed and can withstand very high pressures and back pressures. These check valves are specially designed to handle all fuels and air. The non-return valve is developed to cope with ethanol, so internal components have been adapted for this. This is a full-flow construction that does not throttle the flow. SPD full flow check valve. Used, among other things, for Bosch 044 fuel pumps if you have several that are PWM controlled. This check valve prevents fuel pressure from backing up before fuel pump two or three starts. M12x1.5 - AN8 This check valve does not throttle the flow. This non-return valve makes the car easier to start as it maintains the fuel pressure when the car is switched off. Measure Key socket: 25.2mm Largest diameter: 29mm Total length: 62mm Areas of use Staged activation of fuel pumps When using