Cactus has for sale his Garrett ATX with all the kit on gumtree
http://www.gumtree.com.au/s-ad/milton/miscellaneous-goods/garrett-atx-metal-detector/1122053335?utm_source=facebook&utm_medium=social&utm_campaign=socialbuttons
I don't have a genuine walbanker
But I similar unit
And have used that pump with success
But it is a nightmare to keep the water clean enough to process the material