My RV uses these filters for my sink's filtered water dispenser. I've noticed that the price of these replacement cartridges has gone up a lot over the last few years. Not sure if the manufacturer just stopped making them or what caused the price increase. In all likelihood I'll just have a newer system installed with readily available and less expensive filters.
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NANPU Compressed Air Filter Regulator Combo: Brass Element, Semi-Auto Drain, 0-150 Psi Gauge, And More
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