FISHMATE MEDIUM/LARGE 25/30 WATT(236/237/238/239) GUV  OR ANY POND FILTER UV WHICH REQUIRES A 25 /30 WATT ELECTRICAL WIREWOUND BALLAST.
IF YOU HAVE REPLACED THE UV BULB AND IT IS STILL NOT WORKING,THE BALLAST WILL MOST LIKELY BE AT FAULT.
CHEAPER ALTERNATIVE TO REPLACING THE WHOLE ELECTRICAL LID.EASY SELF DIY REPAIR.
BALLASY ONLY,GEAR TRAY NOT INCLUDED
ALSO KNOWN AS FISHMATE 20000/30000 GUV BUT THE VERSION  350 (20000) IS A 24 WATT PLS UV LAMP SO IS LISTED SEPERATELY