Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
No, but obviously all advice given on here is given as a guide and not an exact solution to a problem, and all work should be consulted on site by a qualifed tradesman before any work commences.
CORGI registrations can be checked on the CORGI website 🙂
Reply to the thread, titled "Corgi" which is posted in UK Plumbers Forums on Plumbers Forums.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.