We have the 37FH model,when you find that button and push it a red light should come on and if you connect to cable push that button again so red light goes off. Several options, you can add a clear 45degree elbow then 8inch extension that puts it below the compartment floor then connect rhino hose. Also I use the 45 elbow then connect my therefore titan hose which has a much longer fitting easier to twist. Also put 45 on then connect the rhino to the 8inch extension before you connect it to the 45,and remember the black pipe the your connecting to does swivel up and down for perfect alignment with hole in bottom of compartment. And finally don't worry about the black cap, the valve shouldn't leak so I put the cap on and twist on semi tight don't stress it'll stay on until next stop.
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