aqua traders seem to have incomplete 520s for sale the only issue is they have no riser tube in the collection cup. any body have any diameter dimensions and lenth of that piece. so i can try to see if i can find that piece. try to save some money over that $100 ebay price tag (w/shipping). $100 is not bad if i can use the pump that comes with it for something.
heres an idea for you guys who are using what may be over size pumps. you can make your skimmer alot more ajustable (increse dwell time...) by putting a reostat on your pump. this is the best way to controll folw of any pump. it actualy slows down the pump. witch =less noise, less electricity, less wear on pump, less hardware (vavles), you can buy a bigger pump and over time as your pump looses effecence you can turn it up. pumps last longer. this applys to all pumps this is a real good for you guys who run high amp pool pumps