The Hallite 513 is a standard profile loaded U cup utilising a polyurethane or polyester shell energised by a high specification resilient O ring.At zero or low pressure the O ring helps to increase the sealing force preventing any bypass. As pressure rises the sealing force increases and the O ring provides complete lip actuation under most conditions.The precision trimmed sealing lips ensure optimum sealing action.Features Flexible for easy installation Excellent resistance to abrasion Positive lip actuation Knife trimmed precision sealing lips Compact housing Wide range of sizes Material optionsMaterialsSeal material - O-ring Standard Material:Polyurethane (Black) - NBRLast digit of part no.10Polyester - NBRLast digit of part no.11Polyester - FKMLast digit of part no.12Hallite 361 TPU - NBRLast digit of part no.16For further information about the different 513 material variants we supply, please contact your local Hallite sales office.