Amazon has a bunch. I got this set. Teflon Tube, AIKEER 3Pcs PTFE Teflon Tube (2 Meters) with 6Pcs PC4-M6 Fittings for 3D Printer 1.75mm Filament (2.0mm ID/4.0mm OD) https://www.amazon.com/dp/B07CCN99FB/ref=cm_sw_r_cp_api_i_2wRLFb4AJ0SPK?_encoding=UTF8&psc=1