Hi, there should be a valve on the incoming pipe from tank to hot water tank.if not you will have to turn off the mains supply to the cold water tank by using the stopcock or ty8ng up the ballvalve arm so the water stops, tben run hot and co!d bath taps till the tank is empty then you cannot kit hen tap. You can then change the pump fitting. Use an old towel to collect any water that may be left in that small section
Hi, yes just drain the tank by running the taps. To get off the push fit connector use a spanner/adjustable spanner the same width as the pipe and push up against the grab ring towards the fit To g ,pushing and turning the spanner in a circle. This should free the pipe from the push fit fitting.