Gecko replacement spa packs are available in many different configurations based on the equipment in the spa. The Gecko S-Class spa pack series can operate anywhere from 1 to 3 pumps plus lights and blower. There is also the Gecko spa pack series IN.XE and IN.XM with a different design that can operate up to 5 pumps and should typically only be used as a replacement for an old IN.XE or IN.XM hot tub spa pack. Most larger Gecko M-Class series spa packs were used in larger swim spas and some built in spas with multiple pumps. 
The Current generation of Gecko hot tub packs include the Y series, YJ series and the YT series for larger hot tubs. The YE-5 series is an excellent and easy to instal replacement pack for spas and hot tubs.

Gecko Y Series hot tub controls
Gecko IN.XE spa packs
Gecko IN.XM hot tub spa pack
Gecko M-Class MSPA
Gecko S-Class spa packs
Gecko topside keypads
Gecko IN-Clear
Gecko replacement circuit boards
Gecko IN.Stream II
Parts for Gecko systems
Gecko replacement parts