Dia. Will develop leaks. If YOU puncture the diaphragm. Most common problem. Tough job repairing. Your time repairing it, is worth the time not using your piston type. Also on diaphragm. Clean out WP's, they will paste up if not flushed. You COULD just cover the bottom of the piston with a type of cover, that prevents dirt particles from going between the piston and the piston cylinder. So it won't scratch the wall between causing irregular drag which can force the piston cup to move in irregular motion, leading to a leak. You can pull the piston out and coat it with petroleum jelly to minimize scratching and drag. 1to 2 times per month should work. Depending on use.
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