Parker - Industrial Pipe Adapter: 1/2″ Female Thread, 7/8-14 Male Thread, Male Straight Thread O-Ring x Female NPTF - 09107954 - MSC Industrial Supply
Carbon Steel, 7/8 in x 1/2 in Fitting Pipe Size, Straight Conversion Adapter - 39A315|10-1/2 F5OG-S - Grainger
1/2 to 3/8 Reducer Faucet Adapter - Compression Brass Pipe Fitting, 3/8 Male to 1/2 Male Supply Line Adapter for RV Kitchen Plumbing, Water Hose Pipe Connector with Rubber Washer, (2 Pack) - Walmart.com
SUNEX TOOLS 3300 3/8-Inch Female by 1/2-Inch Male Socket Adapter with Friction Ball Drive - Amazon.com
Amazon.com: KOOTANS 4pcs Heavy Duty 1/2 NPT Male Thread to 1/8 NPT Female Thread Brass Reducer Hex Bushing Brass Fitting Pipe Hose Tube Adapter Convert : Industrial & Scientific
Brass, 1/2 in x 3/8 in Fitting Pipe Size, Reducing Adapter - 46M451|706120-0806 - Grainger
LTWFITTING 1/2 in. FIP x 3/8 in. MIP Brass Pipe Adapter Fitting (20-Pack) HF1028620 - The Home Depot
Reducer Pipe Adapter 1/2 Female Npt to 3/8 Male Npt Brass Fitting Water Air Gas | eBay
Threading Adapter, NPT 3/8 Male to NPT 1/2 Male
Parker - Industrial Pipe Adapter: 7/8-14 x 1/2″ Male Thread, Male Straight Thread O-Ring x Male NPTF - 72519135 - MSC Industrial Supply
Amazon.com: Legines Brass Pipe Fitting, NPT Adapter 1/2" Female to 1/4" Male Reducing Adaptor 1200psi High Pressure (Pack of 2) : Industrial & Scientific