As a precautionary alert, and okay, a little bit of a rant, you never know what previous owners may have done. Here we have the tee fitting for the double sink drains on our Catalina 30. As you can see a PO, instead of taking the time and effort to properly install the hoses on a proper tee, made their own custom unit which did require the time and effort to grind off the barbs! Granted this is the drain and would normally not be pressurized but it is still connected to a thru hull, which btw, was only single clamped. 

