R134a Low Side 13mm Connector for Valve Core Service The Mastercool 58490-003 is a low-side 13mm connector designed for use with the 58490 Universal R12/R134a Master Kit. This connector allows access to R134a low side service ports for valve core removal and installation without discharging the system. Key Features 13mm Connection: R134a low side standard Low Side Port: Designed for low-pressure side R134a Compatible: Specifically for R134a systems Professional Quality: Durable construction Part of Master Kit: Component of 58490 kit No System Discharge: Works with ball valve system Technical Specifications Model: 58490-003 Type: R134a low side connector Connection Size: 13mm Side: Low side (low pressure) Compatible Refrigerant: R134a Barcode: 700376101133 SKU: 58490-003 HS Code: 84189910 Applications R134a low side valve core service Automotive A/C service Low pressure side access Valve core replacement Used with 58490 master kit Low Side vs High Side Low Side (This Product - 13mm) Low pressure side of A/C system 13mm connection size Blue service port (typically) Lower pressure operation High Side (16mm) 58490-002 — R134a High Side 16mm Connector High pressure side of A/C system 16mm connection size Red service port (typically) Part of Complete System This connector is part of the complete valve core service system: 58490 — Universal R12/R134a Master Kit (complete kit) 58490-002 — R134a High Side 16mm Connector 58490-003 — R134a Low Side 13mm Connector - This Product 58490-378 — GM Large Bore Valve Core Tool 58490-768 — Eaton R134a LP Valve Core Tool Why Choose Mastercool Connectors? Professional Quality: Built to demanding standards Precise Fit: Correct sizing for R134a systems Durable: Long service life System Compatible: Works with ball valve system No Refrigerant Loss: Part of no-loss system Perfect For Automotive A/C technicians R134a system service Low side valve core access Replacement connector for 58490 kit Workshop and mobile service Professional Quality: Mastercool valve core service components are built to professional standards for reliable performance. The 58490-003 is a 13mm R134a low side connector designed for use with the 58490 Universal Master Kit, providing access to low pressure side service ports for valve core removal and installation without system discharge.
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