As above but there is a clamp that holds a pipe on to the OE Dump valve how do you release this clamp so I can fit the bung? Asking to save time so i have the correct tools.

Simpsons !

 

you can use a big pliar or this special tool you get forgor what its called?

 

If its the thick pipe that connects to the oem dump valve then all use should need is a big pair of pliers or waterpump pliers would be easier. On mine the clamp had to be squeezed together to open it, its spring loaded. Then just slide it off.