swab cup

Designed with the bone of elastic steel wire, this kind of swab cup will not touch the tubing wall and gets out of wear and tear when it runs down.As going up , the lip of the swab whose outside diameter will touch the tubing wall strethes to pump liquid . Even though the steel wire which is wrapped by rubber exposes because of possible abrasion ,it would still have the ability of airproof. And this rubber is vulcanized by fomulas against temperature,oil and abrasion. Hence ,this kind of swab cup has long life