Hallman's Pro valve is machined out of billet aluminum and stainless steel pieces. This updated design does not use lock-nuts or allen wrenches; simply turn the adjustment knob and it stays put. This eliminates overboosting as the knob cannot vibrate loose.
3 ft. vacuum line, mounting bracket, mounting clamp, hardware packet and instructions.
Hallman PRO Black MBC # PRO-BK
Hallman PRO Blue MBC # PRO-BL
Hallman PRO Purple MBC # PRO-PU
Hallman PRO Red MBC # PRO-RD
Hallman PRO Silver MBC PRO-SL