1. Direct Replacement O Ring: Fits Pentair and Hayward pool pump strainer covers. Replaces part numbers 35505-1440, U9-375, SPX3000S, and O-12. Confirm your pump model before ordering
2. Compatible with Multiple Models: Fits for Pentair：Max-E-Glas II, Dura-Glas II, Dyna-Glas, Dyna-Max, Dyna-Pro, Dyna-Pro E, Dyna-Wave, IntelliPro VS 3050, IntelliFloXF, WhisperFloXF. Also fits Hayward Super II SP3000 series (SP3007, SP3010, SP3015, SP3020, SP3025, SP3030) and SP3000X series (SP3005X7, SP3007X10, SP3010X15, SP3015X20, SP3020X25, SP3025X30). Works with Sta-Rite pumps as well
3. Exact Fit Dimensions: Inside diameter：approx. 6.23 in, outside diameter：approx. 6.78 in, thickness：approx. 0.275 in. Matches specifications for 35505-1440 and SPX3000S
4. Restores Pump Seal: Replaces worn or flattened lid seals to fix leaks, maintain prime, and reduce air entry into the system. Apply pool-safe silicone lubricant for better seating and longer life
5. Synthetic Rubber Construction: Made from nitrile/NBR rubber with good durability in pool chemicals and chlorine. Stays flexible over time and holds up well against cracking or hardening
