Ron, honestly mate there is no need to be so defensive, people are only trying to help each other on here if there is a chance that you’ve fitted a water fitting on the gas by mistake would you rather not know ?? Would you not be better off calling the customer and saying you think you’ve left a tool behind or something and just checking, surely its better to do that than carry on blindly. Nobody is trying to catch anyone out or make anyone look silly I think I speak for everyone on here that nobody wants to see one of our regular contributors get stung by Gas Safe for something so silly