The MGM Brakes Heavy Duty Steel Non-Pressure Chamber Combination is the perfect choice for heavy duty applications. This combination stroke features a tamper resistant parking chamber design, corrosion fighter composite spring guide, and reinforced non-pressure chamber housing with welded mounting bolts. The nylon reinforced diaphragms provide superior strength and durability, making this combination stroke ideal for tough jobs. With its superior design and construction, it is the perfect choice for any heavy duty application. FleetPride is your First Click in Heavy Duty®.