Complete Service Kit Everything you need for R134A core service: two quick‑coupler tools (red high‑pressure, blue low‑pressure), core remover, 10 R134A cores, 10 5V1 cores, and 8 service port capsideal for automotive and HVAC maintenance. High & Low Pressure Couplers Red tool (16 mm ID) for high‑pressure ports; blue tool (13 mm ID) for low‑pressure. Schrader insert lets you extract and install cores up to 2.5 mm head diameter. No extra hardware needed. Apply a dab of grease to the steel rod for secure core gripping. If wont close with core attached, simply back out the tool slightly to seat the Schrader Rugged, Precision Engineering Brass and copper alloy bodies resist corrosion; steel rods and aluminum‑alloy valves ensure durability. Ergonomic knurled grips prevent slipping, and integrated ball valves stop R134A loss during charging. Specifications Includes: 1× high‑pressure tool (red), 1× low‑pressure tool (blue), 1× core remover, 10× R134A cores, 10× 5V1 cores, 8× port caps Coupler IDs: High‑pressure 16 mm; Low‑pressure 13 mm Core Compatibility: head ≤ 2.5 mm Materials: Brass/copper alloy bodies; steel rods; aluminum‑alloy valves Ball On/off core sealing Use Cases: Automotive A/C, HVAC repair