We are always adding New Items in Our Hot Deals Tab!!! Edit My Account | Order History | View Shipping Costs | View Shopping Cart | Login Shopping Categories > Regulators > Rebuild Kits Rebuild Kit for Hog "BP1" Piston First Stage This is a HOG first stage OEM rebuild kit for the following first stages: Hog Piston first stage BP1 This kit will have all the parts to rebuild your first stageSelect below either a din or yoke first stage! Piranha's Price: $34.95 Select Din or Yoke First Stage Add Din Rebuild Kit Add Yoke Rebuild Kit 21730:+:0,21731:+:0,21732:+:0