I think those are the vent lines and will be seeing seawater. I was brought up to believe you shouldn't use brass below the water line. From the picture it looks very well made and has some things I would like better than my PSS so maybe there is something I am missing. We have had no problems with the PSS for 7 years but if I were putting one on another boat I would definitly look the Last Drop over. I like dripless.