The new Style 3504 GYLON® STRESS SAVER® combines these proven sealing advantages with the performance characteristics of the industry recognized GYLON® 3504 PTFE. The molded raised ribs help to create a tighter seal by concentrating the compressive load, ideal for lightweight piping and glass lined piping. The combination of these two time-tested configurations make Style 3504 GYLON® STRESS SAVER® the ultimate sealing solution.