Olive, AN6 / 3/8, Brass (FIT-OLV6): Ferrules & Olives
Reducer 1/8 Female Npt to 1/16 Male Npt Pipe Adapter Brass Fitting Water Air Gas Fuel
Everbilt 5/8 in. OD Compression Brass Cap Fitting 801019 - The Home Depot
We have Two size. This link is for 4mm olive.
4mm Compression Fitting Olive Parts for Oil Connection Pipe Pack of 10 PCS
HOME-FLEX 3/4 in. CSST x 1/2 in. NPT Brass Reducing Adapter 11-429-101 - The Home Depot
LTWFITTING 1/4 in. O.D. x 1/4 in. O.D. x 1/8 in. MIP Brass Compression Run Tee Fitting (5-Pack) HF714205 - The Home Depot
LTWFITTING 3/16-Inch OD Compression Tee,Brass Compression Fitting(Pack of 5) - Pipe Fittings
Compression 9/16 14mm OD Tube to 1/2 NPT Male Pipe Brass Fitting N-LDES
The Plumber's Choice Brass Compression Coupling Fitting, with Packing Nut, 1 in. Nominal Fitting x 5 in. Length (12 Pack) 2322LCR-12 - The Home Depot