Hi Chewy, welcome to the forum. How long is the course you're on & what is your background/experience in Gas/plumbing? We are always happy to have our brains picked on here, but be warned we will not answer some gas related questions on the public threads which could lead to giving have a go heros a chance to think they can follow our advice and DIY with gas. So please do not be offended if some of your questions are not answered.