The K-Tool International Mini Pistol Grease Gun, No. KTI73930, uses a 3-oz cartridge and offers one-handed operation. Complete with a 4” steel extension and coupler, the KTI73930 has dual discharge ports for added convenience. The top port is primarily used with flexible hose to get into hard to reach places. The grease gun operates up to 3,500 psi and has a one year warranty.