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Honestly it all depends on what unit you have and how much plumbing there is. Each model is plumbed differently, thus some using 4 gallons and others using a gallon. You will be safe with your purchase of 4,if you don't use them all now, you will now know what to get for next year.
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Darwin & Carla
2018.5 3701LK Montana
2022 3500HD Denali Duramax SRW
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