The flexible metal vacuum hose is composed of a plastic mesh bag, a grommet, a tube, a metal hose, and a screw cap. Metal hose can be divided into: spiral wave and ring wave. The spiral wave saves raw materials, and the net weight of the water pipe is relatively light, but the water pipe is hard and not easy to bend.

　　Flexible metal vacuum hoses are long before production, and a piece of tens of meters or even 500 meters is put there. Cut out according to the length that the consumer must. The length of the water pipe is controlled at this time. Some inferior manufacturers make it easier to make profits and lower prices. Will stretch the flexible metal vacuum hose. Because the sale to the consumer is calculated according to the length. Generally, one meter of metal hose can be sold at a price of one meter one to one meter two. Some also use small-sized metal hoses and thin plastic mesh pockets.

　　After the flexible metal vacuum hose is cut out, put on the net cover and cut it out together. Cover the wire sleeves on both sides to prevent the plastic mesh pockets from dispersing. Weld the metal hose and plastic mesh pocket first. Next, put the necessary screw caps on the tube sleeve and perform secondary welding.

　　The flexible metal vacuum hose must be screwed to the vertical surface with the inch thread in the condition of connecting the butt joint. After tightening, there is no need to disassemble and assemble frequently. The surface of the plastic hose does not need to be exposed to boiling water or analytical chemicals. Flexible metal vacuum hoses can rust when exposed to cold water at high temperatures. Reduces the service life of plastic hoses.