(01/28/2010) - I put one of these on my diy calc reactor it works great. I would recommend it to anyone. A calcium reactor is pressurized and it doesnt leak. I am using a Milwaukee ph probe in my calcium reactor fits perfect. One thing I did do is put a little vaseline around the probe and then put it into the bulkhead this helps to seal it better.

(03/28/2008) - This item doesn't fit a standard 1/2" thread, it's just a little too large. Doesn't seem to fit anything else available at lowes/homedepot. The threads are also not long enough to connect a nut on the other side, if you're drilling through 1/4" acrylic ... not that you'd be able to find a nut for it anyway. If you use 2 part liquid or solid epoxy you shouldn't have any issues - thats how i ended up installing it into my ca rx after tapping the lid for 1/2" & scratching my head. Other than that, the item functions as advertised & has no issues. I use it with neptune's probes, as well as other brand probes ... all work the same. seal tight.

(08/22/2007) - simple design but too big for neptune lab grade ph probe.

(06/20/2007) - Drilled appropiate hole size on top of reactor's lid and it works perfect no leaks.

(09/21/2006) - Not sure that the other guy even tried it. This bulkhead seals and has no leaks. Not only that, but I had to use it on another reactor and due to the size of the retainer nut I could not use it. I also cut the bottom of the fitting to be flush with the reactor lid and used Goop to seal it. This does not leak either.

(12/14/2005) - This item is actually an electrical cord bulkhead. The way it is advertised for use will never make it water tight as the bottom end does not have a way to sela water. The probe does fit fine, but the bottom end will never be water tight. It also does not fit any standard plumbing as the 1/2" female thread PVC are too small and the 3/4" PVC is too large. Bought 5 for all my probes, and now they are simply collecting dust. Nice idea though if it did actually work.