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Absolutely true, that IS better.

But if there is already a tee there, I would rather see a plug than a hose bibb.

One very likely possibility: When you replaced a valve dirt and or small pebbles got into the valve assembly/manifold and is wreaking havoc on the valves. Turn off the valve on the PVB and open up...

Sometimes you can skate past replacing any parts by disassembling and cleaning it up. There have been several occasions where I have flushed out a unit and stopped a leak. If it is a febco, it is...

Could possibly be the o-ring as well- I've seen them go bad from time to time.

Installing a hose faucet in the tee under the PVB creates a potential cross-connection. Eventually someone will leave a hose attached and lying in God-knows-what. Better to leave a plug in it, which...