Weld-On 10004 DP-75 Cap Dauber for .75" up to 1.5" Pipe Diameter is a convenient solution for properly applying primers and solvent cements. These replacement caps are available in sizes to fit quart, pint, 1/2-pint, and 1/4-pint cans and feature attached daubers designed for pipes ranging from 3/4 to 3 inches in diameter. To use, simply submerge the dauber head in the primer or cement and then easily apply the liquid to pipes and fittings.