Abstract: A closure member comprises a casing having a plurality of stripe recesses as fluid passages, a valve seat inserted in said casing having a flange portion for sleeving a ring magnet and a high strength material adopted on the flange portion, a piston made of metal or magnetic material to be attracted by the ring magnet, an inner tube inserted in said casing having a central fluid passage, a plurality of supports for positioning the piston and a plurality of stripe protrusions coincident with the stripe recesses of the casing and a base cover attaching to the casing.