Amazon.com : Rhinox Stainless Steel Needle Valve, Accurate CO2 Regulation in Solenoid Fish Tanks, Co2 Adjustment Valve, Used with Rhinox C02 Diffuser Set : Aquarium Air Pump Accessories : Pet Supplies
NVM - Stainless Steel Needle Valve | KOBOLD USA
1/4 inch NPT Stainless Needle Valve for Swimming Pool Gauges
1/2" FF Stainless Steel Needle Valve 6000 PSI
Adjustable female thread stainless steel high pressure Flow Control needle valve | eBay