John crane mechanical seal 59U: 1. Factory outlet 2. Competitive price 3. ... Over 20 years production experience John crane mechanical seal 59U 1. Construction of seal:Face Seal : Carbon, Tungsten Carbide, Silicon Carbide, ... AluminaMetal Parts : Stainless Steel, SUS304,, sus316lSecondary seal : Nitrile, Viton, EDPM, PTFE2. Seal characteristics:1) Unbalanced2) Single seal3) Independent of Direction ...