No but I did overlook the s327 while changing the other one!!!
Sod’s law! Have changed it now & seems to be ok..,
Thanks for the advice

Think the reason it was leaking through barrel is I was trying to fill while cylinder was empty. The air is completely emptying over night & I can hear it escaping from somewhere near filling valve after I have refilled & removed whip. I have taken filling valve apart & replaced internal seal & clea...

Forgot to mention...it’s the new style T bar valve!

My s410 just started leaking air from the barrel while filling...done the usual google search & was advised to change seal inside filling valve...I done this & all was fine until second fill & now leaking air from filling valve...new filling valve maybe?
Any advice would be appreciated