Thermaltake Pacific RGB LED Fittings - Hardtube 16 / 12mm G1 / 4 Inch (pack of 6) [WAZU-758] from WatercoolingUK
Thermaltake RGB Plus 6-Pack RGB Fitting, RBG Software Enabled (TT RGB Plus/Alexa/Razer Chroma), designed for PETG Tube with OD 16mm (5/8") x ID 12mm (1/2"), CL-W185-CU00BL-A - Newegg.com
Thermaltake Pacific RGB G1/4 PETG Tube 16mm OD 12mm ID (6 Pack Fittings) - MOG ICT B.V.