2.5" O-Ring Gasket (Pair) Spa Heaters & Pump Unions

Industry Standard 2.5" Gasket O-rings, designed to work with 2" Flo Thru heater housings, with split nut unions and 1 piece plastic unions. You are getting a pair of gaskets, one for each heater side. This item is called a gasket o-ring, because, it is a gasket and o-ring built into one piece. This helps to assure a tight drip free seal every time. Measurements Inner Diameter: 2-7/16" Outer Diameter: 3-1/2" Thickness: 1/4" with o-ring grooves