Matty Fryatt scored twice in the second half to help his team avoid an upset against the League Two side.
"As we stand here now it's hurricane conditions. It had all the ingredients for an upset and we had to stand up and be counted. We matched their endeavour, they threw everything at us but that little bit of quality shone through with us," BBC Sport quotes the manager as saying.
"Matty Fryatt got injured in his very first game for me, he was out for 13 months and then went out on loan but since then he's been excellent for me.
"He showed what a good player he is, his second goal was outstanding. You are only as good as your strikers, we've brought in a couple and it is looking good in that department."
Hull will find out who they will face in the fifth round when the draw takes place tomorrow.