Polyamide tubing, polyamide heavy tubing, ul polyamide tubing, high-density polyethylene tubing, low-density polyethylene tubing, polypropylene tubing, openable high-density polyethylene tubing, low-density polyethylene tubing, openable polypropylene tubing, openable polyamide tubing, jumbo poliamide tubing, jumbo polyethylene tubing, quick screw straight connector, butt joint connectors.