Topeak Nano Airbooster CO2 Bicycle Tyre Inflator for Threaded Cartridges, Black

Good compact size for going in a backpack for inflating tyres with a co2 cartridge out on the trails.

This is a solid and well made CO2 valve adapter. I've used the spring loaded ones and they are OK but have let me down. Other cheaper products are not reliable after several cartridges have been released. The cold nature of the CO2 when released seems to make any plastics near the cartridge pin that much weaker over time. This does not use cheap plastics, so I am sure it will last. I've used a couple of cartridges to test this product out and both filled a road tyre on my ride very well (around 80psi for a 700 x 28c tyre). I generally used Topeak products such as saddle bags and multi-tools, and they never let me down.

Takes up no room - tried before first ride as I was worried it wouldn’t work but wasn’t disappointed. Worked great with no leaks

My first and only inflator and bought for bike packing so every volume and gram counted.Very surprised with how it worked but beware, you might need some pliers, or in our case a spanner with some padding to grip it and screw it on and off the cartridgeEverything gets cold so gloves or tissues very recommended.

Not great instructions. You screw it all the way onto the CO2, then loosen it 1/4 turn. Then push it onto the (Presta) valve. Not as easy to use as my other inflators, but it's super compact.