Brand new, complete set (pressure gauge and air vent) left over from house project. ✅ Universal Fit – Designed for 1'' manifold systems, compatible with most hydronic heating, HVAC, and plumbing applications. ???? Complete Set – Includes pressure gauge and automatic air vent and drain valve, for easy installation and immediate use. ???? Durable Construction – Made from corrosion-resistant brass for long-lasting performance in demanding environments. ???? Integrated Drain Valves – Allows quick and controlled draining of system pressure without disassembly.