These materials include FKM, Hytrel, Urethane, Nylon, Polymyte, Parbak, and Leather. Back-Ups pair with O-Rings to increase resistance to extrusion and tolerance to some fluids.
- SKU: ORSBSpecial
- Material: FKM, Urethane
- Downloads: Available Materials for Back-Ups.pdf, O-Ring Size Chart