This brass reducing coupling will allow you to go from 1/2 to 3/8 within your gas line. Each end is female pipe threaded, thus any 1/2 or 3/8
1/2 Male x Female 3/8 NPT Pipe Thread Hex Reducer Bushing Brass (5 Pcs) : : Home Improvement
Brass Pipe Fittings - NPTF Reducing Couplings (28-181)
Brass Coupling, Female (1/8-27 NPT) – AGS Company Automotive Solutions
: Industrial & Scientific
Legines Brass Reducing Coupling 1/2 NPT Female x 3/8 NPT Female, Hex Reducer Coupler Adapter Pipe Fitting 1200psi (Pack of 2)
Brass Pipe Fittings - Lead Free 2 X 1 Reducing Couplings, NPT 125 PSI
Brass Reducer Bush Pipe Fitting, Outer Male 3/4 into Inner Female 1/2
Pipe & Fittings - Plumbing
Merababa Brass Reducing Adapter 1/2 Male X 3/4 Female Npt Thread For Pipe Fittings (pack Of 2), न्यूमैटिक फिटिंग - IB Monotaro Private Limited, New Delhi
Brass Pipe Fittings - Grainger, Canada
Gas Hoses & Fittings, Propane & Natural Gas
1/2 x 3/8 Threaded Brass Reducing Nipple, For Plumbing Pipe at Rs 695/kg in Jamnagar
PerPaiMe Brass Pipe Fittings, Water Hose Adapter, G 1/2 India
3220X8X6 by Danfoss, Pipe Adapter, Bushing