Common Spa Electrics Eyeball Returns – 40mm & 50mm Push-in Style. Choose colour, pipe size and pipe Class. Generally used in concrete pools and spas. Maximum flow rate is 250lpm. We never recommend a single eyeball return for gas heaters. See below for our recommendations.
See here for PVC Pressure Pipe Measurements & Classes – nothing measures 40 or 50mm
Number of Eyeballs Recommended for Gas Heaters
- 70mJ to 300mJ heaters – Two Eyeballs
- 350mJ to 500mJ Heaters – Three Eyeballs