I have fitted a couple of toilets in the past. I have always connected the cold water supply via a brass tap connector. However I have just had a new WC delivered and the connection for fitting the cold supply is plastic. Is it OK to fit a metal tap connector to this plastic screw thread or is there a special fitting for this.
Also, I am fitting the toilet to a wooden floor. Is it better to fit the toilet to the wooden floor and tile around it or is it better to lay the tiles first and place the toilet on top of these. The floor tiles are made from porcelain.
When fitting a metal tap connector consider two points. Firstly, don't overtighten it. Leave it on the loose side, and if it weeps, you can always nip it up.
Most importantly, the plastic cross treads very easily!!!! Hand fit and tighten the tap connector first. The nut should turn very easily so if you feel ANY resistance, stop and work out why. You can cross thread plastic by hand.
I try and fit the connector to the toilet first then connect the other end to the pipework second. Much safer.
The only trouble with flexible connectors is they are always on show and look DIY. Thing is though, more and more stuff these days comes supplied with flexible tails, so I find I am using them more and more myself.
Incidentally, porcelain tiles you may know are VERY difficult to drill unless using a diamond drill so for ease, fix the toilet down with silicone and forget about using the screws.