Could you drain the holding tank and take out the back flow preventer. Then couple the tube together and adapt you shop vac to the hose connection on the side of the trailer.... Note be sure to drain the tank first or you could have a large mess.... By pulling a vacumn on the pec line you might be able to pull any partials lodged in the spray head into the shop vac.. Just a thought..
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2020 Ram 3500, 2022 Luxe 38GFB,2500w Solar with Victron equipment, Gen Y Pinbox
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