Water Source 1-1/4 in. Male NPT x 1 in. Insert Barb Reducing Adapter with Rope Loop MAR9125NL - The Home Depot
3/8" NPT Female to 1/4" NPT Male Brass Pipe Adaptor/Adapter Straight Reducer /Reducing Coupling Male to Female: Pipe Fittings: Amazon.com: Industrial & Scientific
NPT Reducing Adapter - Industrial Pipe Fittings On SSP Corp.
PVC Fittings 1.5" x 2" Reducing Male Adapter MIPT x S
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
QuickFitting 1/2 x 3/4 inch Male Reducing Adapter | Patented Design for Superior Sealing | Push On Brass MNPT Plumbing Pipe Connector | for Copper, PEX and CPVC | 5-Pack Reducer Fittings - Amazon.com
Forney 75533 Brass Fitting, Reducer Adapter, 3/8-Inch Male NPT to 1/4-Inch Male NPT - Air Tool Fittings - Amazon.com
Schedule 40 PVC Pipe Slip x Fipt Reducing Female Adapter (1/2" x 3/4" Dia. (5 Pack)) - 435-074 - Amazon.com
Brass Pipe Thread Adapter Fitting - FPT x MPT Reducer
Reducing Adapter R1/4'' Male x Rp3/8'' Female Nickel-plated Brass 16bar (224.8psi) [2 Pieces] | Tameson.com
316 Stainless Steel, 3/4 in x 1/2 in Fitting Pipe Size, Reducing Adapter - 14M046|12-8 RA-SS - Grainger