CO2 regulator adapter W21.8-14 for aquarium with RPV valve

Made of high quality brass material, durable and long lasting. It allows you to attach a CO2 tank to your existing system CO2 regulator. Stable, quiet and no noise. Can be used for CO2 regulator at the aquarium. Easy to install, just twist by hand, no high installation skill required. Colour:brass color Material:copper Size:Height: about 38mm Package Contents: 1X Adapter Converter 1X Mounting fittings kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.