McCallum Replacement Internal Blowpipe Valve This is the replacement for McCallum adjustable and ball joint ball joint blowpipes. Tip: You'll need to unscrew the blowpipe to replace the valve, but it can be tight. We recommend wearing rubber gloves, to get a good grip on both pieces. It's a safe and effective way to separate the pieces, without tools that could damage the blowpipe.
