The Li'l Mac Valve requires you to bore out your blowpipe with an auger. Product Note: These will not work with any blowpipe that has been fitted with a copper tube on the inside (which some pipe makers are now installing to prevent blowpipe cracks). So, please check your blowpipe on the inside to determine if it has a copper tube. If it has a tube, you will not be able to ream out the blowpipe with an auger.
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Extra Li'l Mac Valves a Good Idea
Posted by P.Rob. on 28th May 2016
As a piping competitor and performer, I always keep spare Li'l Mac Valves in my emergency kit. Nothing can bring a good day of piping to a halt like a damaged blow stem valve. Very cheap insurance to have to prevent one of the potential causes of embarrassing breakdowns.