you remove the large chromed plug in the centre of the round part of the pump. It has a screwdriver slot. Don't lose the O ring that seals it! The air and only a dribble of water will come out. You can do it with the pump running, usually. If unsuccessful, try it with the pump off.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local