Solid brass cylinder,cylinder head and piston Replaceable O-ring cylinder head gasket,rubber piston ring and valves Vacuum Pump tester Checks vacuum operated componentsFeaturesSolid brass cylinder,cylinder head and pistonReplaceable O-ring cylinder head gasket,rubber piston ring and valves(kit available)Accurate sensitive bourdon tube gauge:0-30 inches,0 to 760mmRugged steel handleRelease valve24 ...