The classic Silca stainless steel presta chuck.
Found this vintage @silca_velo pump on eBay. Bargain! Now, to leave as is for a workshop showpiece, or refurbish and put it to work? 🤔
Also first time fitting tubeless with #airjordans. Coincidence? Not pictured wheelset: – DT Swiss 350 hubs / Comp spokes / XM421 rims – Vittoria Mezcal 29×2.25 tyres – Stans Sealant