The hilmor 4-valve Aluminum Manifold is built to last with a forged aluminum body. It's designed to be leak-resistant with replaceable stainless steel valve seats, SAE-style O-ring and a securely seated large sight glass. A true 3/8 Inch bore throughout the valve gives you faster vacuum pulls. Front-mounted hose positions and a permanent location for temperature clamps result in added convenience. Plus, comfort grip handles are optimally sized for easier turns. Sold with our retooled gauges and optional 60 Inch refrigeration hoses with low-loss ball valve adapters.