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It is important to regulate the pressure when at the dump station and using the black tank rinse system as well as at a site. The antisiphon valve in the line is supposed to be good for 150 psi BUT it is made in China. They blow out easily especially if there is a sudden pressure surge. Don't ask me how I know. The repair is is a real chore as the valve is in the wall in many cases. I suspect the Chinese plastic may contain impurities and so not be very strong and /or there is poor quality control.
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