Davey Spa-Quip 50mm union O'ring. O-ring is approximately 69mm in diameter and 5mm in thickness. This O'ring is used on pumps, heaters and spa controllers. Was also used by Hayward and Poolpower. . .

50mm Suits:
- Spa Power 1000 & 2000 Control Systems (heaters)
- SP601 / SP800 / SP1200
- SpaQuip Maxi Flow pumps
- Piranha Jet & 2-speed pumps
- Many older Hayward pumps and filters
- Many older PoolPower Chlorinator cells (1 end only)