Put away your nipples! Check this thing out... By MikeB on 10/8/2015MikeB would recommend this product to a friendThis fitting is very underrated. Every single bulkhead I buy gets one of these glued into it. It will never get in the way of removing the bulkhead, and you can screw (and unscrew) a union or valve directly on to it. It simplifies everything. I always end up buying a few for every plumbing job and I have never regretted a single one.