{"product_id":"mastercool-81490-r134a-valve-core-remover-installer-13mm-16mm-connectors-internal-shutoff","title":"Mastercool 81490 R134a Valve Core Remover \u0026 Installer — 13mm\/16mm Connectors, Internal Shutoff","description":"\u003cp\u003e\u003cstrong\u003eThe Mastercool 81490 is a compact valve-core remover and installer that lets you replace standard R134a valve cores without depressurizing the A\/C system.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis pocket-sized service tool combines a built-in internal shutoff with both 13mm and 16mm service port connectors so technicians can access common R134a ports quickly and safely. Constructed with hardened steel shafts, a brass body and a rubber-sleeved steel handle, the 81490 is built for frequent field or shop use. It’s intended for systems using standard R134a valve cores; certain Ford, GM and Chrysler vehicles use oversized or non-standard cores and may require a different Mastercool kit.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the 81490 let me change valve cores without evacuating refrigerant?\u003c\/h3\u003e\n\n\u003cp\u003eThe tool’s internal shutoff isolates the valve core during removal and installation, keeping the system pressurized and minimizing refrigerant loss. That reduces downtime on service calls and avoids unnecessary recovery steps when working on compatible ports.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eBuilt-in internal shutoff to block flow while changing cores\u003c\/li\u003e\n  \u003cli\u003eConnects directly to 13mm and 16mm R134a service ports\u003c\/li\u003e\n  \u003cli\u003eHardened steel shafts designed for repeated core engagement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicles and cores will this tool work with?\u003c\/h3\u003e\n\n\u003cp\u003eThe 81490 is made for systems that use standard R134a valve cores and service-port sizes of 13mm (low side) and 16mm (high side). It will not fit oversized or manufacturer-specific cores found on some Ford, GM and Chrysler models.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompatible with most standard R134a service ports\u003c\/li\u003e\n  \u003cli\u003eNot suitable for Eaton-style or other oversized cores without an adapter\u003c\/li\u003e\n  \u003cli\u003eCheck your vehicle’s valve core type before purchase\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat’s included and what materials ensure durability?\u003c\/h3\u003e\n\n\u003cp\u003eThe kit contains the remover\/installer with internal shutoff plus two service port connectors (13mm and 16mm) and hardened steel shafts meant for long-term use. The brass body and rubber-sleeved steel handle improve grip and resist corrosion in workshop environments.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eOne-piece remover\/installer with shutoff mechanism\u003c\/li\u003e\n  \u003cli\u003e13mm low-side and 16mm high-side connectors included\u003c\/li\u003e\n  \u003cli\u003eHardened steel shafts, brass body, and rubber sleeve for comfort\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat if my vehicle uses a different valve core style?\u003c\/h3\u003e\n\n\u003cp\u003eIf your vehicle uses oversized or non-standard cores, Mastercool offers kits that cover broader compatibility, including options for GM large-bore, JRA and Eaton cores. Select the kit that matches the valve core family used by the vehicle you service.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eMastercool 58490 — standard, GM large-bore, JRA, Eaton compatibility\u003c\/li\u003e\n  \u003cli\u003eMastercool 58560 — Eaton-style cores (common on some GM\/Chrysler models)\u003c\/li\u003e\n  \u003cli\u003eMastercool 58531 — covers standard and JRA cores for many Asian\/European cars\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this is for: The Mastercool 81490 is aimed at professional technicians, mobile HVAC\/A\/C service providers, and experienced DIYers who frequently service R134a automotive systems using standard valve cores. If you need a compact, durable tool to swap valve cores quickly without system evacuation and your vehicles use conventional R134a ports, the 81490 is a practical, field-ready choice. If you encounter non-standard cores, consult Mastercool’s alternative kits for the correct fit.\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 valve cores without recovering refrigerant?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The 81490’s internal shutoff isolates the port so you can remove and install standard R134a cores without depressurizing the system.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this fit all R134a service ports?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. It fits most standard 13mm and 16mm R134a ports but not oversized or some OEM-specific cores used on certain Ford, GM, and Chrysler vehicles.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Mastercool","offers":[{"title":"Default Title","offer_id":48079806791838,"sku":"B000KITSMI","price":65.15,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/mastercool-81490-front-view-tool-assembled.jpg?v=1785771245","url":"https:\/\/northtrailauto.ca\/products\/mastercool-81490-r134a-valve-core-remover-installer-13mm-16mm-connectors-internal-shutoff","provider":"North Trail Auto","version":"1.0","type":"link"}