{"product_id":"mastercool-r134a-valve-core-remover-installer-kit-58490-compact-case-works-under-pressure-brass-stainless-shutoff","title":"Mastercool R134a Valve Core Remover\/Installer Kit — 58490 Compact Case, Works Under Pressure, Brass\/Stainless Shutoff","description":"\u003cp\u003e\u003cstrong\u003eThe Mastercool 58490 is a professional R134a valve core remover\/installer kit that lets you remove and fit valve cores while the system stays pressurized, preventing refrigerant loss and saving service time.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis compact, technician-focused kit is built around Mastercool’s patented shutoff valve and includes all connectors, shafts, and adapters needed to work across most R134a automotive platforms. Rather than evacuating refrigerant, you can replace defective or leaking cores quickly and accurately on the vehicle. The set organizes components inside a molded carrying case for mobile work or bench use, and the brass-and-stainless construction is specified for repeated field use.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this kit prevent refrigerant escape during service?\u003c\/h3\u003e\n\u003cp\u003eThe 58490 uses an integrated shutoff\/ball valve and precision sealing connections so you can break into a Schrader valve without discharging the system. You attach the adapter, close the internal valve, remove or install the core, then reopen for a leak-free return to service. This reduces refrigerant loss and avoids time-consuming evacuations when a core change is the only required repair.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePatented shutoff valve control for pressure isolation\u003c\/li\u003e\n  \u003cli\u003eBrass body and stainless valve for durable sealing\u003c\/li\u003e\n  \u003cli\u003eHigh- and low-side connectors match vehicle service ports\u003c\/li\u003e\n  \u003cli\u003eOperation allows core change with system intact\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich valve core types and vehicle fittings are supported?\u003c\/h3\u003e\n\u003cp\u003eMastercool designed this kit to cover the most common R134a valve core varieties and the specific thread types used by different manufacturers. Included shafts and adapters handle standard 0.210-36 cores, JRA M6x0.75 cores, and Eaton-style cores with 8mm and 10mm threads. The kit also supplies both 13mm low-side and 16mm high-side R134a connectors plus GM\/Ford high-side adapter fittings for broad compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eStandard valve core shaft (0.210-36) included\u003c\/li\u003e\n  \u003cli\u003eJRA shaft for M6 x 0.75 cores\u003c\/li\u003e\n  \u003cli\u003eEaton shafts for 8mm and 10mm applications\u003c\/li\u003e\n  \u003cli\u003eR134a high (16mm) and low (13mm) side connectors plus swivel\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat components come in the case and how are they organized?\u003c\/h3\u003e\n\u003cp\u003eThe molded carrying case holds the remover\/installer with its shutoff valve, multiple interchangeable shafts, R134a high- and low-side connectors, a 1\/4\" FL swivel connector, and several vehicle-specific adapter fittings. Everything snaps into dedicated cutouts so technicians can inventory the set quickly and keep parts protected during transport. The format supports both shop storage and on-vehicle service calls.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRemover\/installer assembly with shutoff valve\u003c\/li\u003e\n  \u003cli\u003eInterchangeable core shafts for all listed core types\u003c\/li\u003e\n  \u003cli\u003eHigh- and low-side connectors, swivel, and GM\/Ford adapters\u003c\/li\u003e\n  \u003cli\u003eDurable molded case with secure storage layout\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable and serviceable is the tool for daily shop use?\u003c\/h3\u003e\n\u003cp\u003eMaterials and manufacture are chosen for repeated professional use: the main body is brass for corrosion resistance, the ball valve is stainless steel for long wear, and shafts are hardened steel to withstand repeated threading and torque. Mastercool has over four decades of A\/C tool development behind this design, and U.S.-based support is available if you need replacement parts or troubleshooting.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBrass body resists corrosion from refrigerant exposure\u003c\/li\u003e\n  \u003cli\u003eStainless steel ball valve for long life and reliable shutoff\u003c\/li\u003e\n  \u003cli\u003eHardened steel shafts resist wear from frequent use\u003c\/li\u003e\n  \u003cli\u003eBacked by Mastercool’s technical support and parts network\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The Mastercool 58490 is intended for professional automotive HVAC technicians, mobile A\/C service providers, and well-equipped fleet maintenance shops that service R134a systems. It’s ideal when valve core servicing is needed quickly and you want to avoid unnecessary refrigerant recovery steps—especially useful for busy shops that value speed, part coverage, and durable, repairable tools.\u003c\/p\u003e\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 change a valve core without evacuating R134a refrigerant?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The 58490’s shutoff valve and sealing connectors let you remove and install cores while the system remains pressurized.\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. The kit includes shafts and adapters for standard, JRA (M6 x 0.75), and Eaton (8mm and 10mm) valve cores.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Mastercool","offers":[{"title":"Default Title","offer_id":48082532958366,"sku":"B00069V310","price":257.3,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/mastercool-58490-front-packaging.jpg?v=1785811469","url":"https:\/\/northtrailauto.ca\/products\/mastercool-r134a-valve-core-remover-installer-kit-58490-compact-case-works-under-pressure-brass-stainless-shutoff","provider":"North Trail Auto","version":"1.0","type":"link"}