Atlas Cylinders 4-inch bore Piston Seal Kit is a replacement kit for Atlas hydraulic cylinders that use a 4" piston sealing surface. It is offered in nitrile (NBR) format as ATL-4B00S040S and in fluorocarbon format as ATL-4B00S040V to match different chemical compatibility needs. The kit provides the piston seals and seal elements required to renew the sealing interface and reduce internal leakage, helping restore cylinder performance in standard hydraulic service. This 4" bore piston seal kit is commonly referenced in Atlas seal-kit catalogs for repairing worn seals on applicable Atlas cylinder assemblies.
