T5 Submersible 40W UVC
 
Submersible UV-C lamps have a big advantage compared to conventional UV-C units.  No pressure loss or water restriction due to being fitted in the pond pipework
 
Benefits
These lamps can be used in filter tanks so the water can pass without any resistance/ pressure loss.
The plastic end of the lamp has a 32mm diameter so you can use 32mm pipe clips to mount the lamp in a tank.
A special tank connector is available for direct installation in i.e. filters.