Ronxing FLOJET 305730006B 21.5 oz Accumulator Tank Internal Bladder 125 PSI Max Mini xz

I thought the unit was defective as it seemed it would not hold air. I found with experimenting that it, that if I filled it with 45 lbs of air it works as designed. The pump now waits to turn on and slowly shuts down after use. Pump is much quieter.

Works great for my cabin