No idea of the thread size but it's a standard part used on air powered systems can be purchased from air line suppliers of perhaps Ebay.
 
I have tried bsp , npt and metric with no joy.have also tried el cheapi silencers off ebay that won,t fit
 
I have tried bsp , npt and metric with no joy.have also tried el cheapi silencers off ebay that won,t fit
I have never had cause to check the thread size, working on air powered machines, there was always a bin full of them available so sorry I cannot help.
 
These 8mm compression fittings screw in nicely. I think they are 1/4 bsp threads?

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Thanks for the replies guys, i have a silencer but am always on the lookout for cheaper replacements/spares.with shipping included to australia even the ebay offerings work out dear.have tried bsp fittings and they do not fit. Was actually looking to fit a hose to it to make it easy to check leakage whilst i was getting valve block back into working order
 
Try an NPT fitting, or leave it out. Took mine out so I could hear when it's doing its thing, and never got round to putting it back.
 

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