I don't know that whacking anything will get it out. Once the bolts are removed the port is loose. The plate on the bottom of the boat is slightly pressed on the bottom of the port and requires a little prying. Nothing major. Whatever sealant was used in my before was not holding it in place. That's why I put mine back with 4200 and not 5200. If I ever have to replace that o-ring again, I don't want the sealant pulling gelcoat or fiberglass off!