Booster, Master & Prop Valve Kit: 8" Booster Double Diaphragm - unpaintedREAD THE "DESCRIPTION" section on LHS lower page: Brand new full kit that hangs off the firewall .. good for restricted space engine bays.. a double diaphragm booster and dual master with proportioning valve.. lines and brackets.. use brackets if needed. Used particularly for the 55 70 era full size or restricted engine room area conversions to disc front Drum Rear and or disc Disc. We can make it with prop valve to the LHS as shown OR horizontal