Signode Pneumatic Sealers – Pneumatic sealers let compressed air do most of the work. They are used to achieve high productions on heavy strapping, especially when seals are in awkward positions or whenever productivity must be maximized. These labor-saving crimper sealers come in two basic styles. Those featuring pistol grips are lightweight for easy one-handed operation. Diaphragm types are for heavier-duty applications, such as carloading. All pneumatic sealers are furnished with a quick-disconnect plug. An air filter and regulator are necessary. A lubricator in the air line is not required.