Could any of you plumbers out there tell me what "Rp 3/4" is all about.....it's quoted in the installation book for my new Worcester boiler (for the gas connection). The book says i MUST use 22mm supply pipe for the gas, but the fitting on the boiler is this "Rp 3/4", so i'd like to know what "Rp" stands for as i've searched plumbing websites, but haven't had any luck.
hope someone can enlighten me