Female fitting - olive coupling.

Everbilt 3/8 in. Female OD Compression Brass Coupling Fitting 803119 - The Home Depot

BRASS COMPRESSION FITTINGS – Irrigation Unlimited

Nylon Olive Fittings – Brasshards

Male Straight Coupler Radiator · Compression Fittings Copper · RMMCIA

How to use a compression fitting

193 SERIES 120 DEGREE FEMALE COUPLER – Hyperflow Performance Inc

0105 04 10, Legris Brass Pipe Fitting, Straight Compression Coupler, Male R 1/8in to Female 4mm

20mm X 15mm C x C Union Copper Olive Compression

15mm Female X 15C Union Copper Olive Compression BSP 1/2