Grofry 1/4 inch NPT Male to 1/2 inch NPT Female Brass Pipe Fitting Reducer Adapter - Walmart.com
304SS 1/4" O.D Tube Fitting x 1/4" NPT Male - EQ-Fit-14-14
Stainless Steel Swagelok Tube Fitting, Male Connector, 1/4 in. Tube OD x 1/4 in. Male NPT | Male Connectors | Tube Fittings and Adapters | Fittings | All Products | Swagelok