You know when it's time to recharge your AC refrigerant with the EZ Chill R-134a Trigger Gauge and Hose. This fully reusable gauge and hose provide accurate pressure readings with a large display for easy diagnostics. The gauge indicates when you need a recharge, can help you identify the current low-side pressure in the system and allows you to determine increases in pressure during the recharge process. Refilling your car refrigerant with the trigger-style dispenser and a 90-degree coupler that reaches tight locations is easy. Just start the engine, turn on the A/C and locate the A/C service port before attaching the coupler. If you need help, an online Port Locator is available to find the port on your vehicle's make and model. This gauge is compatible with any R-134a refrigerant valve can. It’s easy to recharge your A/C with the EZ Chill gauge. For the budget-conscious DIYer, the EZ Chill car care line offers what you need to get the job done at a price that fits your needs.