What's the difference between a water stop screw and a three-stage water stop screw?

Hello, the difference between water stop screw and tertiary water stop screw.

The names are different, but they are all a kind of water stop screw.

The product structure is different. The first-stage water stop screw consists of a screw, a stopper in the middle and two locating pieces or ribs at both ends, and the third-stage water stop screw consists of an inner rod welded with water stop pieces, two outer rods and two connecting nuts.

Their production processes are different, which is determined by the product structure.

In the consumption part, the external rod is useless after a period of use, which is equivalent to a water stop screw has been completely consumed; The three-stage water stop screw only consumes the middle inner rod, and the outer rod and joint can be reused.

The three-stage water stop screw greatly reduces the cost.

It is easy to peel off the film with three-stage water stop screws.

The three-stage water stop screw wall has good flatness after demolition, and it is easy to form a dry wall, which has passed the acceptance.