Ideal Vacuum | Adapter 1/4 inch hose barb to 1/2 inch ID Male NPT, Stainless Steel, Vacuum Fitting, Swagelok, SS-4-HC-1-8
Buyers Products 2-in to 1-1/4-in Hitch Adapter with Corrosion-Resistant Zinc Plating - Easy Conversion, Durable Steel Construction in the Trailer Hitch Receivers department at Lowes.com
G Thread (Metric BSPP) Male to NPT Female Adapter - Lead Free (1/2" x – Cascada Showers
Amazon.com: Quickun Brass Hose Barb Reducer 1/2" to 1/4" Barbed Reducer Fitting Reducing Splicer Mender Union Adapter for Air Water Fuel : Industrial & Scientific
Grofry 1/4 inch NPT Male to 1/2 inch NPT Female Brass Pipe Fitting Reducer Adapter - Walmart.com