{"product_id":"sr7-valve-spring-brake-k021578","title":"SR7 VALVE SPRING BRAKE - K021578","description":"The Bendix Sr7 Valve Spring Brake K021578 is a spring brake valve used in heavy-duty truck air brake systems to manage airflow to the spring brake chambers. The valve incorporates anti-compounding to help prevent simultaneous service and park brake application and features a 3\/8 PTC balance port and 3\/8 PTC control port for straightforward plumbing into the air system. Four 3\/8-18 NPT delivery ports provide multiple outlet connections, while the 1\/2-14 NPT supply port and 1\/4-18 NPT park control port support standard air line sizes. The exhaust is oriented facing down and uses an exhaust adapter without silencer to direct exhaust air away from surrounding components. The unit mounts using two 3\/8-16 UNC-2A studs with a stud length of 0.94 inches. Operating temperature ranges from -40 degrees F to 200 degrees F (-40 degrees C to 93 degrees C), with a spring brake hold-off pressure of 107 psi and compliance with FMVSS 121 requirements for air brake performance in commercial vehicles.","brand":"BENDIX","offers":[{"title":"Default Title","offer_id":49057064419579,"sku":"K021578","price":1472.02,"currency_code":"AUD","in_stock":true}],"url":"https:\/\/www.tranzmile.com\/products\/sr7-valve-spring-brake-k021578","provider":"Tranzmile Truck \u0026 Trailer Parts","version":"1.0","type":"link"}