Universal adapter with Luer connector for transmission instruments (ISO 9168) for bringing-in of cleaning and maintenance products (WL-clean, WL-cid, maintenance oil) and for blowing-out of with WL-dry/WL-Blow. Also suitable for blowing-out by using the multifunction syringe and to bring in the cleaning solution WL-clean via Luer connection e.g. into general hollow part instruments.