{"product_id":"mastercool-r134a-valve-core-remover-installer-kit-58490-brass-body-with-shutoff-valve-multi-shaft-case","title":"Mastercool R134a Valve Core Remover\/Installer Kit — 58490, Brass Body with Shutoff Valve, Multi-Shaft Case","description":"\u003cstrong\u003eMastercool 58490 is a professional R134a valve core remover\/installer kit that lets technicians replace valve cores without evacuating refrigerant, using a built-in shutoff valve to preserve system pressure.\u003c\/strong\u003e\n\nThe 58490 kit streamlines A\/C service by combining high- and low-side R134a connectors, multiple interchangeable shafts, and precision adapters in a molded carrying case. Designed around Mastercool's original patented technology, this tool supports a wide range of valve core types found in passenger vehicles so you can work faster, cleaner, and with less refrigerant loss.\n\n\u003ch3\u003eHow does this kit let me change valve cores without discharging refrigerant?\u003c\/h3\u003e\n\u003cp\u003eThe kit’s valve core remover\/installer includes an integrated shutoff ball valve that isolates the system while the core is removed or installed. This preserves system pressure during service and reduces the need to recover refrigerant or pull a vacuum.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBuilt-in shutoff valve for safe isolation under pressure\u003c\/li\u003e\n  \u003cli\u003ePrecision sealing to minimize refrigerant escape\u003c\/li\u003e\n  \u003cli\u003eCompatible with standard service procedures for R134a systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich valve core types and vehicle fittings does the 58490 cover?\u003c\/h3\u003e\n\u003cp\u003eThe 58490 supports standard 0.210-36 cores, JRA (M6 x 0.75) cores, and Eaton-style cores in both 8mm and 10mm sizes. It ships with multiple shafts and adapters so you can service most R134a passenger vehicle ports without sourcing extra parts.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStandard valve core shaft and GM large-bore shaft included\u003c\/li\u003e\n  \u003cli\u003eJRA and Eaton (8mm\/10mm) dedicated shafts\u003c\/li\u003e\n  \u003cli\u003eHigh-side 16mm and low-side 13mm R134a connectors plus 1\/4\" FL swivel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and construction features improve durability and performance?\u003c\/h3\u003e\n\u003cp\u003eMastercool built the tool to withstand professional shop use with a brass body, stainless steel ball valve, and hardened steel shafts. Those material choices resist corrosion, provide smooth valve actuation, and ensure long-term dimensional accuracy for repeatable service.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBrass body for corrosion resistance and reliable sealing\u003c\/li\u003e\n  \u003cli\u003eStainless ball valve for smooth operation and durability\u003c\/li\u003e\n  \u003cli\u003eHardened steel shafts for wear resistance and precise fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat comes in the case and how does it simplify shop workflow?\u003c\/h3\u003e\n\u003cp\u003eThe kit is an all-in-one solution with every adapter and shaft organized in a molded carrying case to keep components protected and easy to find. That means less downtime hunting parts and a clear layout for field service or mobile technicians.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eValve core remover\/installer with shutoff valve\u003c\/li\u003e\n  \u003cli\u003eHigh-side (16mm) and low-side (13mm) R134a connectors plus 1\/4\" FL swivel\u003c\/li\u003e\n  \u003cli\u003eStandard, GM large-bore, JRA, Eaton 8mm and 10mm shafts and adapters\u003c\/li\u003e\n  \u003cli\u003eMolded carrying case for organized storage and transport\u003c\/li\u003e\n\u003c\/ul\u003e\n\nWho is this for\n\nThe Mastercool 58490 is built for professional HVAC and automotive technicians who service R134a systems and need a fast, reliable way to change valve cores without losing refrigerant. It’s especially useful for shops and mobile techs that service a variety of vehicle makes and models and require durable, organized tools backed by U.S.-based support from a well-established A\/C tool brand.\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I remove an R134a valve core while the system is still charged?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The 58490’s integrated shutoff valve lets you remove and install valve cores without discharging the system when used correctly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this kit fit Eaton and JRA valve cores?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It includes dedicated shafts for JRA (M6 x 0.75) and Eaton-style 8mm and 10mm valve cores.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Mastercool","offers":[{"title":"Default Title","offer_id":67584909443257,"sku":"B00069V310","price":381.87,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/mastercool-58490-front-view-case-open.jpg?v=1790458686","url":"https:\/\/redleafauto.ca\/products\/mastercool-r134a-valve-core-remover-installer-kit-58490-brass-body-with-shutoff-valve-multi-shaft-case","provider":"Redleaf Auto","version":"1.0","type":"link"}