How do you adjust the pressure relief valve on a Polaris 280?
How do you adjust the pressure relief valve on a Polaris 280? Polaris Pressure Relief Valve (180/280/380/3900) It can be manually adjusted by screwing it in our out of the wall fitting housing. Screwing it all the way in give the Polaris the maximum amount of pressure and speeds it up, unscrewing it will relieve the pressure and slow the cleaner down.