Bathroom radiator hot on both hot water and central heating...

[Ric2013]

I think you must have removed the chrome from the last bit, as I'm told that it really won't work at all if you don't.

 

[S.P.S.]

I have tried it, then been able to slide the fitting off with out pushing the locking collar in....

 

[Ric2013]

Yeah, thought as much, but thank you for confirming. I'd never tried it as I had been told it wouldn't work/had read technical literature (and, probably, because I've never had occasion to put speedfit onto chrome). A bathroom installer, not trained as a plumber told me it wouldn't work, and I assumed that he'd found out the hard way.

 

[Ric2013]

Yes , lol . Those pushfit connectors are the dogs pal , far better than a fibre washer that could last one week or twenty years .

Or fifty? When I wasn't qualified or working as a plumber, I reused a tap connector onto a new-secondhand FOV in a house I had lived in for 21 years. Unaware that the red bit was replaceable, I left the original washer in place. The washer was already at least 20 years old, and had, quite possibly, been in place since the house was built 49 years prior (in 1962) to my re-using the part. Or would you assume that the washer MUST have been replaced at some point? I'm assuming it may have sprung a trace weep at some point and then furred up.

The tap connector was originally connected to a BRE Garston type valve (an early incarnation of the Part 2). Sadly, the cistern was asbestos cement and, not wanting to disturb fibres, the original FOV was disposed of with the cistern itself.

Epilogue: the house was sold 3 years later, still with the secondhand washer in place and no evidence of leakage.

 

[S.P.S.]

Yeah, thought as much, but thank you for confirming. I'd never tried it as I had been told it wouldn't work/had read technical literature (and, probably, because I've never had occasion to put speedfit onto chrome). A bathroom installer, not trained as a plumber told me it wouldn't work, and I assumed that he'd found out the hard way.

1 of the 3 lengths of chrome tube did this. The other bit ok, it was a test to see how they held. Needless to say the one slip was enough to persuade me!!!

 

[Stigster]

I have tried it, then been able to slide the fitting off with out pushing the locking collar in..

I found that out the hard way when I was a 2nd year apprentice on my first shower replacement job. I piped up an exposed shower valve with nice neat chrome copper drops from the loft and used a couple of Tectite elbows up there without realising I needed to file away the plating. Already nervous as it was one of my first unsupervised jobs, I turned the supplies back on and they both blew off immediately. Water damage fortunately limited to the ceiling above the shower enclosure.

I was very grateful they went immediately instead of later that night at least. Lesson learned the hard way, as always.

 

[S.P.S.]

I would guess it’s down to the playing being harder than copper so the teeth can’t dig in.