This brake chamber meets or exceeds OEM standards and adheres to SAE tensile strength standards. For example, this OTR spring brake chamber has a superior sealing function. The die-cast 360 spec aluminum center adapter has a plated push rod and precision ground micro-finish. In addition, this OTR brake chamber’s center seal grooves provide an optimal double O-ring sealing for long life. As a result, you receive the reliability, safety, and durability you should expect from your heavy duty brake chamber.