Tefen 12012204048 Nylon 6/6 Pipe Fitting, Hex Nipple, Blue, 1/4" BSPT Male (Pack of 10): Industrial Pipe Fittings: Amazon.com: Tools & Home Improvement
Tefen Fiberglass Polypropylene Compression Tube Fitting, Tee Adapter, Blue, 6 mm Tube OD x 1/4" BSPT Male x 6 mm Tube OD (Pack of 5): Compression Bulkhead Fittings: Amazon.com: Industrial & Scientific