We apologize but do not carry the parts for Stanley sprayers are not familiar with their parts. We would recommend reaching out to the manufacturer directly to confirm the correct part.
According to the manufacturer, the Chapin Pump Assembly - Complete with Ergonomical Handle part # 1 will not work with the Harvest King 22980- 3 gallon sprayers. It is advised that you use Part #301525-1 for the Harvest King model 22980. Please let us know if this is something you would be interested in getting.
Yes, the Chapin Pump Assembly - Complete with Ergonomical Handle part # 1 will work with the Chapin model 1253 2-gallon sprayer.
We carry the Chapin Pump Assembly - Complete with Ergonomical Handle part # 1 by request. The handle works for many different Chapin sprayers, so it is sometimes a cheaper alternative than replacing the entire sprayer.
The Chapin 301233 Replacement Pump Part - Model #301233 would be the correct replacement pump for the Chapin Model 31430.
The pump assembly that you would need for your Chapin 2 Gallon Metal Sprayer #31421 is part 6-4619.
The correct replacement pump that should fit to model 30600 is Chapin 6-4619 Replacement Pump Part (#6-4619).