Gas help please!

Hi folks, hope you're well!

I was with a friend looking at his camper the other day and he's had a problem with the gas. Long and short, there were two regulators... In fitting the second a replacement part couldn't be got, and now the best option looks like either blanking off where the second line joined, if a suitable blanking cap can be found... Or is there any possibility part a would fit to part b?.

Thanks for the reply!

B is currently blanked off, and because the other sides are fitted with the thin metal piping i wasn't sure if I could do a swap..

The other side of the t at A, was the same fitting and a separate regulator. Pic to follow... The connection broke on that side, and the replacement piece is a Hairs breadth difference in circumference and won't thread!

Looks like a real dodgy over complicated bit of gas plumbing.
Get a certified gas installer with motorhome gas systems experience to sort it out.
A proper regulator which will accommodate two high pressure pigtails (one for each bottle) is what's needed.