8pcs/lot Hard Tube Fitting OD12mm/OD14mm/OD16mm Hand Compression Fitting G1/4' 4 Layer Seal Ring use for PMMA/PETG Rigidity Tube

Copper Hard Tube Fitting, Bykski Fitting Od12

Pacific C-PRO G1/4 PETG Tube 16mm OD Compression – Chrome

Bykski OD14mm/OD16mm Hard Tube Fitting Hand Compression Connector G1/4'' Computer Accesspries for Acrylic PETG Tube B-HTJ-L14

Barrow Miniature reduced thread Washer O ring Black/Silver/White PC water cooler fitting heat sink TWDQ15 - AliExpress

Granzon GD-FT14 , Anti-off Hard Tube Fitting , For OD14mm Hard

Barrow Rigid Hard Tube Bending Tool Water Cooling Multi-Angle For Acrylic / PMMA / PETG Computer Water Cooler Modding ABQYG-16A - AliExpress

8pcs/lot Hard Tube Fitting OD12mm Hand Compression Fitting G1/4' 4

Bykski 90 Degree OD12mm/OD14mm/OD16mm Hard Tube Rotary Fitting

Pacific C-PRO G1/4 PETG Tube 16mm OD Compression – Black (6-Pack