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What part so I need? I can't find an "accumulator". I'm.havi g the vibration as well.The pump used in the Mist King and other systems is a diaphragm pump. These pumps have a built in bypass. The purpose for the bypass valve in the pump is to regulate the pumps output pressure. It works when the pump builds up pressure and it isn't used, it dumps the pressure and then instantly pumps the pressure up again after the valve closes.
So when you have only a couple of nozzles you are constantly hitting the max pressure, dumping it and then pressurizing the line and dumping it and back and forth. each pulse of the pump is this action. It isn't a bad thing, just how these pumps work. It is why they can run all day dry or wet and not burn up.
I had an issue with my RO system where my gauge was bouncing because of the pulses.... To remedy this I used a T fitting, hooked one part of the T to the pressured line and then took another tube and connected both ends of it to the two remaining openings on the T fitting. This creates a air pocket and smooths out the pulses.... This is a crude way of making an accumulator. If you head to Home Depot or Lowe's they sell something similar for like 10-15 bucks. Tell the sales person you have pulsating flow of water in your water pipes and you need a small accumulator, they should be able to figure out what you are talking about.
For now... All I can suggest is a longer tube and don't tie them down to the cage and place the pump on a piece of 2" thick foam. I run a lot of nozzles so my pump just hums away quietly and is mounted to a wooden board.