6/8/10/12mm Hose Barb Inline Water/Air Gas Fuel Line Shut-off Brass Ball Valve. BSP Female Thread 1/8" 1/4" 3/8" 1/2" Brass Pipe Fitting Adapter DIY Coupler. 2PCS 1/8 1/4 3/8 1/2 Female-Male Pipe Thread Brass Reducing Adaptor Connector.
eBay