Hitech Continuous Screen Changers are Fully Automatic and Maintain Consistent, Uniform Melt Pressures and Temperatures Indefinitely with Closer Tolerances and Tighter Gauge Controls. the 120 (36 M) Roll of Screen is Equivalent to Several Hundred Screen Packs and Lasts Several Months in Non-Stop Operation Eliminating the need to Handle Hot Breaker Plates and Dirty Screen Packs. They have No Mechanical Seals or Moving Parts to Wear out or Replace, and are Unconditionally Guaranteed Against Leaks for ...