Pentair 35505-1440 Trap Cover O-Ring Replacement for Pentair Pool and Spa Inground Pumps Trap cover O-ring replacement Fits Pentair WhisperFloXF Pool and Spa in ground pumps Fits with Sta-Rite Max-E-Pro series pool and spa in ground pumps This trap cover O-ring use with Sta-Rite Dyna-Pro/Dyna-Pro E pool and spa pumps Replace O-rings when cracked or swollen