This one is loud without the PWM and is still not quietier than fans. I use the PWM to lower the voltage down to about 9vdc and pulse the power on and off. If you look at the picture in the other thread the pump in mounted in a 4X4 marine electrical box.
Like I said in the other thread I would like to get the jabsco pump but I'm having a hard time finding one, as this is a new product. I got an e-mail form them yesterday, I'm trying to getting an engneering sample and test it out.
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