Universal H-Series 400,000 BTUs Inground Low NOx Pool Heater - Natural Gas power-source_Propane It measures approximately 5 inches

It measures approximately 5 inches in diameter

Standard solar covers are 8 mil

This is a Stainless Steel hex head cap screw 5/8"-11 x 12"

This is a replacement Pentair Back-Up Valve Gear Assembly

Universal H-Series 400,000 BTUs Inground Low NOx Pool Heater - Natural Gas power-source_Propane It measures approximately 5 inchesThis Hayward Universal H Series Natural Gas Pool Heater is 400,000 BTUs, has dual voltage, and features a commercial grade cupro nickel heat exchanger. It has Low Nox emissions and 2 inch x 2 1 2 inch CPVC union plumbing connections. The Universal H Series gas heaters are the "universal" energy efficient remedy for any new or existing pool or spa. The cupro nickel heat exchanger comes standard on all H Series heaters. The heat exchanger is chemical