The Waterway Power Series and Quad-Flo Jets are no longer made, but Hot Tub Essentials has stock on both. The Quad-Flo Jets will also replace the discontinued Waterway Dual-Flo Jets.
These jets can be identified by having a threaded blue ring, but may be discolored on old jets.
This jet can also replace "Select-A-Jet" Inserts, common in Galbocca and other hot tubs.
The face diameter is 4-3/4" and will also replace Waterway Dual-Flo Jets.