Hand operated vacuum pump for teachingHand operated vacuum pump for teaching 1.Plastic cylinder and cylinder head,several colors are available. 2.Replaceable O-ring cylinder head gasket,r
Hand operated vacuum pump1.Aluminium cylinder and cylinder head. 2.Replaceable O-ring cylinder head gasket,rubber piston ring and valves. 3.The body was the switch to control
USA hand operated vacuum pump1.Solid brass cylinder and cylinder head. 2.Replaceable O-ring cylinder head gasket,rubber piston ring and valves. 3.Precise pressure gauge:0-30inHg,
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