It helps to type in the word "sprayer" ; then click on APPLY.

Here you go:

http://agtalkplus.com/?q=all_classifieds&field_type_of_ad_value_many_to_one_op=or&field_type_of_ad_value_many_to_one=All&field_item_category_value_many_to_one=All&keys=sprayers