I've just replaced the main washer in a stop-cock as it was weeping slightly along the tap entry shaft. The washer had stopped the cold supply OK but there is still a weep along the shaft as before. The tap is 1970 vintage and difficult to get at for full replacement. I was wondering if the new washer needs to bed in to stop the weep or, is it possible to replace the 1971 screw out unit (leaving the original pipe fitting in place) with a new unit, ie is the thread the same and is the seating compatible.
thanks
thanks