This bracket will fit a 65mm dia. spindle. The thread is 1/4 BNC (19tpi) for standard pipe spigot is for 10mm I/D braided hose.

Flexible coolant pipe: https://www.ebay.co.uk/itm/1-4-Flexible-Plastic-Water-Oil-Coolant-Pipe-Hose-For-Lathe-Milling-CNC-Air/122809162657?ssPageName=STRK%3AMEBIDX%3AIT&var=423249241648&_trksid=p2057872.m2749.l2649

10mm I/D braded hose: https://www.ebay.co.uk/itm/PVC-HOSE-Clear-Flexible-Reinforced-Braided-Food-Grade-OIL-WATER-Pipe-Tube/222316032671?ssPageName=STRK%3AMEBIDX%3AIT&var=521160128307&_trksid=p2057872.m2749.l2649