I acquired a section of blue water pipe(10”) , it actually measures 10 3/4” O. D. I plan on burying it to hide valuable that I can access when needed. I want to cap one end and the other will have the screw cap. Will a regular 10” cap fit, or do I need a special type? And then should I just look for a regular piece of white pvc pipe? I would love 12”-14”. Just don’t want to break the bank on screw cap.