Resistoflex expansion joints are made of contour molded PTFE, providing exceptional corrosion resistance and flex-life. The flexible liner is molded over the metallic sealing face. Different numbers of convolutions accommodate varying degrees of misalignment, axial travel, and angular deflection between components. 2 Convolutions - compensates for minor movement between components Available 1" - 12" Least movement 1/4"- 1/2" Least Misalignment 1/8" - 1/4" Highest Pressure Ratings Full Vacuum Rated 3 Convolutions - compensates for moderate movement or misalignment Available 1" - 8" Moderate Movement 1/2"- 1-1/8" Moderate Misalignment 1/4" - 9/16" Moderate Pressure Ratings Full Vacuum Rated 5 Convolutions - compensates for the most deflection, misalignment and axial travel Available 1" - 6" Highest Movement 1/2"- 1-1/4" Highest Misalignment 1/2" - 5/8" Lowest Pressure Ratings Not Vacuum Rated Stainless Steel Armoured PTFE Expansion Joint