Siphon

Bosch Siphon (Part 8718600689) is a condensate trap intended to collect and discharge condensate produced by condensing boilers and water heaters, while providing an air‑ and odour‑tight trap between the appliance and the building drainage. Designed for straightforward installation and routine servicing, it consolidates condensate flow to a single outlet, helps prevent backflow and sewer‑gas ingress, and simplifies replacement during maintenance. (bosch-homecomfort.com) Note: I could not locate an official Bosch North America product page listing part number 8718600689 on Bosch Home Comfort / Bosch Climate sites; this description is based on Bosch parts documentation and product literature for siphons. (bosch-homecomfort.com)