Orbit 1/2 in. x 3/4 in. MNPT Poly Adapter 37217 - The Home Depot
2-Inch X 1-1/4-Inch NPT Tank Adapter — GREAT PLAINS INDUSTRIES
Parker - Industrial Pipe Adapter: 1/2″ Female Thread, 1-1/16-12 Male Thread, Male Straight Thread O-Ring x Female NPTF - 09107970 - MSC Industrial Supply
Brass Pipe Fitting 1/4 Inch Female Pipe 1/2 Inch Male Reducer Adapter Air Hose Adapter Metal Pipe Adapter 2 Pack - Amazon.com
Grofry 1/4 inch NPT Male to 1/2 inch NPT Female Brass Pipe Fitting Reducer Adapter - Walmart.com
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
POWERTEC 70140 2-1/2” to 1-1/4” Hose Reducer – Conversion Unit for Dust Collection Accessories - Amazon.com