My old SR didn't, and had I not exchanged it for the Humber, It would now have a set! Humber had one and the other blocked up for a 'leccy pump. Suffice to say the second one has now been reinstated.
They have the advantage that they work as long as you are moving, and as said can dump a lot of water very quicky. Usually a good idea to run the release (lift) line to the console so you can work them at a moment's notice. Just my opinion, but the short cord & jam cleat on the transom is one small step above a chocolate fireguard.......