hi, the feed is a 15mm copper pipe, the connector on the cistern is a plastic male connector, the nut off a 15mm compression fitting fits onto this.
the first fix plumber put a isolating valve on the feed. rather than have too many connections i will just replace that with the pipe from
screwfix.
Flex Tap Connector Valve 15mm x ½" if i wanted ones for a bath tap would they be 15mm * 3/4 ?