Chapin 6-7701 Extension Tube. The great thing about Chapin sprayers and accessories is the ability to repair anything with their huge selection of parts. Chapin makes high quality products that will last for years of use. Purchase a new sprayer or repair your old one. Fits Chapin Sprayers: 1739, 21210, 21220, 21240, 6002, 1180, 1253, 1280, 1380 and 1480.