I removed the aerator on my kitchen faucet and attached a hose for a time and cleaned the aerator. Now I cannot get the original one to screw back into the place without it leaking (well spraying mostly). Any suggestions on ways or tools to get an aerator firmly back in place?
Plumbing – How to fix a leaking faucet aerator
faucetleakplumbing
Related Solutions
Actually, it sounds more like a siphon or vacuum breaker working fine. It's not leaking with pressure on. When you turn off the sillcock and release pressure on the hose, it moves the water in the hose away from the sillcock, creating a vacuum at the faucet, which causes the siphon breaker valve to open. Then the water rebounds a bit and some comes out. They have only failed when they leak under pressure, or do not open at all. The brass cap thing on top of this sillcock is the built-in vacuum-breaker. The type described in Steven's answer seems more likely given where you say water is coming out. In either case, I don't see any sign of failure from your description of the behavior.
I just needed to tighten it more. I bought a better wrench, tightened it more, and now it doesn't leak.
Best Answer
Is there any chance you've cross-threaded it? If you're sure it's not cross-threaded, then I'd check for a missing washer or O-ring. It may have blown out of the aerator when you were backflushing it with the hose.