Weld-On 10008 7020 Jumbo Roll-A-Weld 7″ Roller for MT-648 gal Can delivers thorough and consistent application of primers and cements onto pipes and fittings. Designed to fit MT-648 empty gallon cans and wide-mouth cement cans, this combination roller and cap ensures you always have a primer and cement applicator on hand. The 7-inch rolling dauber is suitable for pipes with a diameter of 6 inches and larger. The wooden handle is securely attached to the inside of the cap, allowing you to simply remove the top of the can and easily apply the primer or cement to pipes and fittings.