Viega Union Connector 1", Male x Female Thread, Art. 447021

It gives a 1" screwed line a joint that you can open without cutting the pipe. The R 1 male end screws into a female port, such as a valve, and a pipe with a 1" male thread goes into the Rp 1 socket. Loosening the central nut parts the halves at their conical sealing face, so the neighbouring valve or appliance can be taken out.

R stands for a tapered male thread and Rp for a parallel female thread. The Rp 1 socket therefore takes a pipe or nipple with a 1" male thread, while the R 1 end is itself male and screws into a 1" female opening, for instance in a valve body or another fitting. Both ends are 1" in size, so the union does not change the line size.

No. Viega marks model 3341 as not suitable for gas installations, so use this 1" union only on the drinking-water and heating lines it is intended for. For gas pipework, choose a fitting that Viega approves for gas, and agree the type of joint with your installer.