"PS" Seals (Pac-Seal, John Crane, US Seal, etc) Below is a lising of common US Standard Type 21 single seals referenced by their "PS" part number. Each in standard materials of construction - Carbon vs. Ceramic Faces with Buna Elastomers. Specific dimensional details can be found by clicking on the seal Part No. There are hundreds of other seal types and sizes available, so please contact us. Please contact us if you need: Pricing for seals not shown below Material Upgrades : NiR, SiC, TC, EPDM, Viton, etc. Double Seals or Special Configurations Metric Dimension Seals Standard Seals by Size • PS-359 (5/8") • PS-358 (3/4") • PS-703 (7/8") • PS-235 (1") • PS-356 (1-1/8") • PS-185 (1-1/4") • PS-177 (1-3/8") • PS-758 (1-1/2") • PS-238 (1-5/8") • PS-237 (1-3/4") • PS-340 (1-7/8") • PS-267 (2")