Product Details: The MGM Brakes 3" Type 30 Long Stroke Service Brake Chamber with Welded Yoke is designed to provide reliable performance. It features an epoxy-coated formed steel pressure cap and diaphragms with heavy duty nylon reinforcement for superior durability. The chamber also has air ports on the top and sides to provide a more leak-free seal. This brake chamber is ideal for heavy duty applications and will provide reliable performance. FleetPride is your First Click in Heavy Duty®.