I believe that part is called a 'hydrolock' on Moen faucets.
It is designed to cap the port on the faucet (under the sink) where a typical sprayer wand would attach. Since it appears your sprayer is built into the head, it is likely just a cap.
You are almost going to have to know the manufacturer of the faucet assembly or contact Georgetown to determine where to get parts.
2016 Flagstaff 8529IKBS Diamond Package 5th Wheel
Ford F-Series SCREW 4x4
TST Tire Monitor - Sinemate 3500w Gen.
2016 Nights Camped = 42