Unfortunately we do not carry any Stanley products so we cannot say for sure whether or not the Chapin Poly Brass Extendable Wand with Viton would be compatible with that particular unit. You may want to contact Chapin directly to see if they can tell you if this part will work for your needs. You can reach Chapin by calling 800-444-3140.
No, the Chapin Poly Brass Exntedable Wand with Viton 32 in. (6-7770) can't be connected to the Chapin Poly Foamer 1 gallon (#2658E). You can use the Chapin Curved Poly Extension Wand for Poly viton Sprayers 18 in (6-7749) in place of the original wand or you can attach it to the end of the wand to make an extended one.
Per the manufacturer, the Chapin Poly Brass Extendable Wand with Viton is an extension wand replacement for Chapin sprayer model numbers 22350, 29002 and 29003.