For this job, it was acquired of me to rehab crawlspace that had cast pipe, galvanized pipe, and copper piping and CPVC . All defective and against code piping was removed and replaced with PEX-A piping and new copper in certain locations. all work was tested for leaks and no leaks were found. All work documented with photos. Current water pressure after replacing PRV is 50 psi. after the halo was installed, the purge was conducted however, have the test in water I would recommend waiting a couple of days to retest.