hilmor 1839110 R410A 4-Valve Manifold with Hose and Dual Readout Thermometer Built with a forged aluminum body and designed to be leak-resistant with replaceable stainless steel valve seats Get faster vacuum pulls with a true 3/8" bore throughout the valve. Bonded steel with SAE style straight thread with O-ring Rubberized handles are optimally sized for easy turns,Pressure Range Low: -30"HG/300/500 psi. Pressure Range High: 0/800 psi Offers easy access with front-mounted hose positions and a permanent location for temperature clamps A pressure reminder allows you to set the pressure ring and reference it later