Two Little Fishies ATL5460W 6-Pack Micro Valve Barb X Barb
Micro fittings for regulating air flow through standard airline tubing for devices such as air-stones, filters, protein skimmers, ornaments, etc. Also for low pressure liquid feed lines for metering pumps, fish display holding cubicles, fertilizing systems, calcium reactors and drip irrigation of water gardens and paludariums.