To answer your question, you have to access thru the underbelly, drop or cut an opening, and you can manually open and dump. Agree with Montana Man, I have also replaced failing cable pulls with direct pulls. Mine was not as simple to install as described above, but not all that hard either. Did require some plumbing rerouting and cable pull relocation.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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