looks like a 1/2" to 3/8" threaded hose barb or could be 3/8" to 1/4" threaded hose barb. no size comparison so hard to tell
looks like a 1/2" to 3/8" threaded hose barb or could be 3/8" to 1/4" threaded hose barb. no size comparison so hard to tell
My Reef is Alive and well Despite My repeated Daily attemps to kill it!!