Mastercool 58490-YF R1234YF Universal Master Valve Core Kit Brand_Calvan Alstart meets the highest industry standards

meets the highest industry standards

Weatherproof cast-iron design with high-flow 1¨ inlet and outlet

Installs in place of oil filter providing ports to attach oil pressure tester

This set includes 12 of our most popular retaining ring pliers

Deluxe Classic Velcro Backing Plate

Mastercool 58490-YF R1234YF Universal Master Valve Core Kit Brand_Calvan Alstart meets the highest industry standardsThe perfect tool for replacing damaged valve cores with R1234yf refrigerant in the system without losing the systems charge. Attaches to R1234yf service ports to quickly and easily remove and replace valve cores without the loss of refrigerant Ball Valve design with stainless steel ball provides smooth movement and durability Kit covers 17 mm and 14 mm high and low side service ports INCLUDES: Valve assembly High side 17 mm connector Low side 14 mm