Whisperflo lid o-ring (new style) O-318 / O-218 Whisperflo New Style O-Ring (After 11/98) fits the newer style Pentair/Purex Whisperflo pump lid. O-Ring WFE Cover OEM MFG# 350013, MFG. # O318 ALA, 355332 PAF, ALA-601-5489 Also fits Pentair 700 HydroPump lid U9-229 352600 Also replaces O218 - O-RING, TRAP COVER fits Sta-Rite Dura-Glas and Max-E-Glas pool and spa pumps w/ 5" Trap MFG. # U9229 STA, 351021376 HRZ, O218 ALA INSIDE DIAMETER: 5-7/8" OUTSIDE DIAMETER: 6-3/8" CORD THICKNESS: 1/4" Pentair/Purex Whisperflo pump lid (After 11/98) Pac-Fab Challenger (Old Style) Pentair 700 HydroPump lid (U9-229 352600) SMF PUMP Lid Sta-Rite Dura-Glas Trap Cover Sta-Rite Max-E-Glass Trap Cover