The Wabco air brake chamber, part number 9253921090 or 925-392-109-0, is a Type 30/30 cam-operated air brake chamber built to OE specification. It delivers a maximum operating pressure of 145.0 psi and a release pressure of 66.72 psi, with a push-rod stroke of 2.99 in and a push-rod length of 3.55 in. The chamber measures 14.29 in in total length and mounts via 5/8″-11 UNC bolts spaced 4.75 in apart (bolt length 1.50 in). Port threading is 3/8″-18 NPTF at a 160-degree port angle, and the clevis pin diameter is 0.51 in. The unit is supplied without boot and is rated for an operating temperature range of -40 C to +80 C. Call us to confirm proper fit for your application.Interchanges:WAB9253921090FeaturesType 30/30 cam-operated air brake chamber, OE specificationMax. operating pressure: 145.0 psi; release pressure: 66.72 psiStroke: 2.99 in; push-rod length: 3.55 in; total length: 14.29 inMounting bolts: 5/8″-11 UNC, 1.50 in length, spaced 4.75 in apartPort thread: 3/8″-18 NPTF at 160-degree angle; clevis pin 0.51 inTemperature rated -40 C to +80 C; supplied without bootTech SpecsBrand: WabcoType: 30/30Type of operation: CamTechnical specification: OE specificationMax. operating pressure: 145.0 psiRelease pressure: 66.72 psiStroke: 2.99 inPush-rod length: 3.55 inTotal length: 14.29 inBolt threads: 5/8″-11 UNCBolt length: 1.50 inDistance between bolts: 4.75 inPort thread 1: 3/8″-18 NPTFPort thread 2: 3/8″-18 NPTFPort angle: 160 degreesClevis pin diameter: 0.51 inTemperature range: -40 C to +80 CVersion: Without boot