Unfortuantely, the Chapin Brass Wand(Part #6-8149) will not work with the sprayer model 61800. The correct wand for that is the Chapin Replacement Spayer Tube - Part 6-8219.
Unfortunately, the thread size at the end of the Chapin Brass Wand (Part# 6-8149) is proprietary information that the manufacturer will not disclose. The brass wand will fit Chapin Tree/Turf Pro 4 Gallon BackPack Sprayer (#62000).
