Grundfos 595916 circulation pump, provides near-instant hot water from water heater.
Pump only, excludes misc parts needed for install (power cord, 2 hoses).
Full kit retails for approx $325 at big box outlets. Amazon listing here (includes image):
https://www.amazon.com/Grundfos-GRU-595916-595916/dp/B000JG81AQ?th=1