Tondiamo 22 Pcs PE Valve Filter Set Replacement Valves for Coffee Canisters with 2 Rubber Rings, Degassing One Way Breather for Bean Container, Bag, Food Bags

I purchased these Tondiamo Replacement CO2 Valves as the pack also contianed spare O rings just in case they were needed too. The valves seem to fit my canisters well, so should in theory be doing a great job of letting out the CO2 gasses and keeping the outside air out of the canisters. A point to note which influenced me making this purchase, CO2 valves (from my own research) seem to need replacing quite frequently. Unfortunately, the actual frequency that they need changing is quite controversial. I therefore will be going for somewhere between 3-6 monthly to change the valves to help keep my coffee beans fresher for longer. They are easy to use and seem to be of quite good quality. They appear to provide the function that they should and are good value for money.