HydroQuip CS4000 SLIDE Series Pneumatic/Air control system available with "plus OZONE". This system comes with a SLIDE style L-Shaped, 1.375/5.5KW Heater Assembly. 24hr Timer With Mode Switch and Full Range Thermostat. Also Available in Versi-Heat Series w/ 60” Htr Cord (-VH suffix) & Plus Ozone Option (-03 suffix).