The OTR 3" Stroke Piggyback Brake Chamber Kit is the perfect solution for those looking for superior force output consistency. This kit features a rugged powder-coated service housing for corrosion protection and superior power spring technology for unparalleled force output consistency. It also comes with a diaphragm, nuts and bolts for mounting, making it easy to install and use. FleetPride is your First Click in Heavy Duty®.