This is a bibb? Faucet? that goes from the outside wall of the kitchen to a PVC into the ground and feed the drip irrigation / sprinkler. I notice a small puddle outside these days and after drying up everything with a towel, in a few minutes I see some small amount of leak showing up at the red circles area in the photos. Seems like the thread into the top "tap" at the PVC "coupler" has some teflon tapes and the bottom of this coupler at the red circle going into the PVC "thread" has some algae growing.