The drainage bag has a spiral interface. What other interface?

Drainage bag has screw joint and common butt joint. According to the relevant public information, the joints of drainage bags are all single joints, spiral joints and common butt joints, depending on the drainage tube interface left in the patient's wound. Clinically, two kinds of drainage bags with different joints are usually prepared to adapt to different interfaces. It is not convenient for hospitals to equip with medical materials, so two kinds of drainage bags and drainage tubes should be equipped.