The Dow Pro 14 Foam-Dispensing Gun offers accurate bead control and increased yield while providing a quick and convenient way to apply insulating foam sealant. It features a stainless steel check valve and durable construction. It is used to dispense Great Stuff Pro series insulating foam sealant into any gaps or voids in the SIP system around electrical boxes. floor and top plates, window bucks and any other penetrations into the SIP System.