Can I install a quick disconnect fitting on<br />the factory flush hose on the engine?<br /><br />Does cooling water flow through this hose or only flush water goes to head then out bottom?<br /><br />Do the thermostates have to be open to flush correctly using the engine flush hose.<br /><br />I am using Salt Away which works very well on the exterior boat/windows, how well does it work in the inside of the engine?<br /><br />Thanks a bunch!