The file 'Hatsan PCP Pump Wall Mount 3D Printer Model' is (stl) file type, size is 1.4MB.
Print 2 of these to be able to mount your Hatsan PCP pump on a wall.A Hatsan pump handle is ~34,75mm diameter but the mount has margins up to 37mm.
Countersink for a 5,5-6mm screw.