The 19L S-type PE supply tube is matched to same-size H-type cylindrical liner bags. Formed in one piece from ultra-high-purity PE, it suits weakly corrosive electronic photoresist ancillary reagents, balancing cleanliness performance with cost advantage. Before dispatch it passes strict dual testing for particles and metal ions and will not introduce impurity contamination into the media. A side hole at the top of the tube balances internal pressure, preventing the liner bag from collapsing under negative pressure and blocking liquid during extraction. The one-piece PE connector is simple and leak-free and links directly to production line piping — an economical supply component for mild high-purity chemicals in pilot workshops.