The OMT AC Manifold Gauge Set 3 Way is a high-quality tool set designed for refrigeration charging with R12, R22, R502, and R134a. Made of brass, aluminum, and PVC materials, the set includes 3 hoses in red (high), blue (low), and yellow (charging) colors with a burst pressure of 3000 psi. The low and high pressure dial ranges are -15 to 350 psi and 0 to 500 psi, respectively, and the quick coupler is adjustable for R134a. This durable and reliable set is perfect for HVAC and refrigeration professionals looking for precision and efficiency in their work.