You have successfully added from to your part list.
PPG Semco 250080B 250-B Gun is used for pneumatic application of adhesives, sealants, potting compounds and other materials that are held in Semco disposable cartridges and Semkit packages. It is handleless, lightweight, reduces applied material cost, durable, and allows accurate material control. An air hose to operate the gun must be ordered separately. 8 oz.