212-7630G Waterway Power Gunite Jet, Directional Internal, White-Grey-Black 212-7637G, 212-7631G Once the jet is plumbed and gunited into the spa, the internals are interchangeable and serviceable same as a portable spa. Four nozzles (1/4" to 5/8", 8gpm to 25gpm) are shipped with power gunite jet internals. 4-15/16" face diameter