Tow behind sprayer (will need some testing)

Up for sale is a used tow behind sprayer pump. It has not been used in years and primarily for liquid fertilizer and a couple tree insecticides treatments. It has a jabsco 12v pump with diverter valve for hand sprayer wand or for a ground sprayer rail. There is also a cone filter in the jabsco pump which should be common to rv or marine. Hasn’t been tested yet or used in a while but I’m quite confident it just needs a purge and the nozzle aperatures checked. I will hook it up to 12v and attempt to purge/clear the nozzles. Most units this size will go for $500+. Given the age and good potential of putting back into service, I am asking $200.