Today, I made a 'Nitrox Stick' from bits and pieces I had in the house. "What's a nitrox stick?" I hear you ask. Well, it's a device that will allow one to continuously blend nitrox (and trimix with some modifications - watch this space) through a compressor. Introduced upstream of the compressor intake, the percentage of nitrox required is 'dialled-in' with the regulator and monitored on the analyser. It enables one to drain an O2 cylinder to a few bar and also to do top-offs when the O2 cylinder doesn't contain enough gas to do partial pressure blending. Parts list: Vandagraph VN202 oxygen analyser (with T-piece and flow diverter from the DIN kit) O2 welding regulator and a length of tubing 75 cm length of Marley 32mm waste pipe Standard Seatec LP nipple (as found on a drysuit inlet valve or BCD inflator) 50mm length of 33mm glue-lined heat shrink tubing 2 balls of stainless steel wool (like one uses to scour pans) - this is inside the pipe and acts as a baffle to mix the O2 with the incoming air so that the analyser can get a good average reading Not shown is the 20mm OD reinforced hose pipe that connects this to the inlet on my compressor. This was salvaged from a part that came with an old Karcher pressure washer that was meant to scavenge water from a butt. The analyser cost me £80 from eBay about 10 years ago. It can take old Sentinel rebreather cells (R17) but I always buy fresh sensors from Vandagraph. The regulator was less than £20 on eBay a year or so ago (I bought it to fine-tune the LP flow to my booster but never bothered using it). The other stuff was just lying around in my man-cave.