For the Chapin 2 Liter Multi - Purpose Sprayer (10031), the small tube should either push into or thread into the inside of the cap on the unit. So unscrew the cap and you should see the hole where you insert the tube into the cap.
For additional assistance, please contact Chapin directly at 800-444-3140
Unfortunately, we do not have replacement parts for this sprayer. You may try contacting Chapin directly to see if they may send you one, however we do not have separate parts available for sale for this specific model, unfortunately. You may reach Chapin directly at 800-950-4458.
