No, the other part is an isolation valve, arrow shows direction of water flow. You dont need to do anything drastic to comply with regs, simply replace the existing bib tap outside with a new tap that contains a double check valve. http://www.screwfix.com/p/pegler-hu-bib-tap-with-check-valve/11558 Jobs a good un.
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