Thanks for the replies!
The other 3 links are waterproof, but I can't tell if they are shunted. I was hoping to find shunted waterproof sockets. The tank is open topped and I didn't want to cover the light. However I may have to cover the light if waterproof shunted sockets do not exist.
Maybe someone else will chime in...
Most modern sockets are already shunted. I know one of the water proof ones I linked to has two pair of push in connectors, so you can jumper them easily.