Bill .. if I could tell you how all that worked I would have needed to graduate from Harvard. The guy who installed it must have just bought shares in the hose manufacturing company.....or possibly the company making the plastic 'ties'. There was honestly OVER 60ft of hose total and had to be 100 ties !!! While I have NO doubt this system could ' slice,dice and do julian french fries ' I just couldn't figure it out. All joking aside , you could pump head to tank , head over board and tank overboard......I just couldn't find the instructions. The big attraction to the Ariel was the pleasing lines and simplicity of sailing a small boat.....so ...45ft of 1 1/2 hose , 98 ties and 3 Y valves later I have a simple system again. Guess I should have got that engineering degree !! Frank #50