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. Suits these 50mm Unions. 40mm O-rings listed here.
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)