Am I missing a pump part? (Gamo Urban with a third party pump)

Pump I bought: https://www.ebay.com/itm/3-Stage-PCP-Air-Gun-Rifle-Filling-Stirrup-Pump-Hand-Pump-4500PSI-Pistol-Charging/283050929770?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

This is my first PCP. I am having trouble getting the pump connected to it.

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As you can see, both the hose nozzle and the adapter that came with the gun are both male, and the same diameter. Is the a part I can order to connect them?