The OTR 3030 Type Standard Stroke Piggyback Brake Chamber Kit ensures Expertise Built In , being engineered to deliver high performance power and eliminate downtime. This heavy duty piggyback brake chamber kit's zinc-finished clamp bands offers consistent long-life pressure and corrosion resistance. This piggyback spring brake chamber kit comes with a diaphragm, nuts, and bolts for mounting. Provide service braking, emergency braking, and parking you can rely on for your heavy duty semi truck needs with this heavy duty long stroke piggyback brake chamber. FleetPride is your First Click in Heavy Duty .