The MAXIMA and OPTIMA have complete repair modules that are simple to remove and replace as a unit. All removable parts from the modules that can wear are provided in the OPTIMA repair kit, which can be used to repair either style of pump. Each kit includes diaphragms, flapper valves, flapper stoppers, rubber hinges, and valve gaskets. Modules and repair kits can be easily obtained at your local pet dealer for rapid service in case of failure. Failure of the coil, rheostat, or any other electrical parts requires proper service from an authorised repair depot.