Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Use of PTFE tape on domestic gas fittings - OK. Max pressure of domestic gas is 60PSIUse of PTFE tape on domestic mains water - OK. Max pressure of domestic water is 80PSIUse of PTFE tape or any other sealant on hydraulic vehicle brakes is a no-no! All fittings must be assembled dry. The 'lock-up' pressure in a non-servo assisted brake pipe is approx. 900-1000PSI. The metal brake pipes have to be manufactured to withstand a test pressure of 5000PSI. Leave the PTFE tape in the drawer in the cupboard with the plumbers fittings.