Up Aqua's Pierce CO2 7-piece starter package is all you need to get going in the wonderful world of planted aquariums. This fantastic kit contains a micro regulator, CO2 disposable cartridge, cartridge stand, bubble counter, check valve, CO2 atomizer, and a suction cup for mounting the atomizer into the aquarium. No more oversized scuba diving equipment needed for maintaining the proper CO2 in your setup that can get costly. The Pierce CO2 Package is all you need and easily hides out of sight due to its compact size. Refill with UA-141 and UA-142 Important Info: Use teflon tape on any fitting that does not seal with a gasket or o-ring. DO NOT OVER TIGHTEN.