The RODAC Air Conditioning Gauge and Accessory Kit has an aluminum body designed to measure pressure. This kit includes quick disconnect connectors including a 2 1/2" Blue Gauge (low) - 0-120 PSI with 0-40VAC , a 2 1/2" Red Gauge (high) - 0-500 PSI as well as 1/4" FFL x 72" Red and Blue Hoses with fittings and a 1/4" ACME x 72" Yellow Hose with fittings.