Sprayhead only (as shown in photo) for Pfister 1-Handle Pull-Out Kitchen Faucet 133-10SS kitchen faucet. When you activate the sprayhead, it works fine, but otherwise you only get a trickle - probably needs a new aerator. (Pfister sent me an entire new sprayhead - great warranty! So I don't need the old sprayhead anymore.)
https://www.pfisterfaucets.com/kitchen/product/pfirst-series-133-10-1-handle-pull-out-kitchen-faucet