Hypertherm Water Tube Cartridge, 420728 1 per package This Hypertherm Water Tube is intended for use with the Hypertherm HPR Cartridge system. The HPR cartridge for Hypertherm HPRXD plasma systems replaces five consumables with one perfectly aligned cartridge that delivers industry-leading consumable life and longer cut quality. That means you can produce more consistent, higher-quality parts while lowering operating costs.