Adhesive & Sealant Guns and Applicators can be powered manually or pneumatically. Manual applicators have a trigger mechanism to control the dispense rate. Pneumatic applicators use air pressure to control the dispense rate, resulting in an even flow and preventing operator fatigue. 2-part applicators are used with dual cartridge materials. Typically, mixing nozzles provide correct mix ratio as well as thoroughly mix the A and B parts together. 1-part applicators are typically used to dispense 10 to 29 oz tube style cartridges as well as 300ml, 400ml and 600ml sausage packs. Most applicators are capable of handling both high and low-viscosity adhesives and sealants.