5/16-24 to 3/16 compression fitting with nut and ferrule.

60X3 by Danfoss, Compression Fitting, Sleeve, 3/16 Tube OD

Brass Swagelok Tube Fitting, Male Connector, 12 mm Tube OD x 3/8 in. Male ISO Parallel Thread, Straight Shoulder, Male Connectors, Tube Fittings and Adapters, Fittings, All Products

700068-1012 Midland Lead Free Compression Fitting, Male Adapter, 5/8 Tube OD x 3/4 Male Pipe

FTG75-1H Compression Fitting w/Breakaway Ferrule - BASO Gas Products LLC

700066-0304 Midland Lead Free Compression Fitting, Female Coupling, 3/16 Tube OD x 1/4 Female NPT

✅ [QUALITY MATERIAL] Made of brass, these compression sleeves ferules are lightweight material but good toughness, high strength, features corrosion

Hilitchi 3Sizes Tube OD 3/16 1/4 5/16 Brass Compression Sleeves Ferrules Compression Fitting Kit (SAE, 180Pcs)

Quickun Brass Compression Fitting Ferrule Sleeve, 5/16 Tube OD (Pack of 30) : Industrial & Scientific

47205 - Compression Tube Fitting to NPT Adapter Straight

Breezliy 150PCS Tube OD（1/4 5/16 3/8 1/2) Brass Compression Sleeves Ferrules & Insert,4 Sizes Brass Compression Fitting Assortment Kit : Industrial & Scientific