Your peevish excuse for an apology is irrelevant - what is relevant is to give accurate advice and not to scramble about defending rubbish and then name calling as though someone else is responsible for your lack of knowledge.
Every item ever sold over a counter is a commercial transaction - no one goes up to a trade counter and asks for a "commercially available shower valve" - perhaps you cut to the chase and ask for "a commercial transaction"?
Yee gods man you really are a piece of work, I've tried to be polite to you in the past but have just about had a guts full of your pedantic, hair splitting. No-one else on this site runs peoples ideas or suggestions down like you do, or seems to manage to get peoples backs up like you do. Were you neglected as a child or something and now feel the need to be the centre of attention. Some day you might realise that there is more than one way to skin a cat and that the world according to Vinn isn't the only way to do things.
Of course you wouldn't ask for a "commercially available shower valve" but I wasn't ****ing doing that was I, I was pointing out that such a thing was commercially available as opposed to making the same up using plate elbows and ply or similar.
I have fitted god knows how many of those bristan plates they grip the pipes themselves and if you clip the pipes too close too them then you lose all the advantages of being able to fit them after panelling as you need a little movement and flex in the pipe work to do so.
As to my knowledge base you have no idea, I have worked in the building game for over 25 years running my own business for nearly 20 of them, have built several houses from the ground up, both for clients and myself as well as developing, renovating, converting and extending plenty more.
Unlike some I have never claimed to know everything and don't need some jumped up keyboard warrior telling me what I do or don't know, as I said there is a whole world out there outside of Vinnland.
Oh and by the way did you not realise it wasn't an apology.
Not that it will bother you, but after 13 years of being on this site,you are the first person to be added to my ignore list, so bye bye and good luck.