Is this product for you? Very versatile, it accepts both cartridge and bulk loading.How easy is it to use? The convenient design allows one-handed operation to be extremely easy to achieve, while the trigger allows you to easily manage the flow of grease flow by a simple squeeze and release. The installed plunger ensures a constant grease flow by using pressure to push it forward.Where can you use it? It is ideal for maintaining trailers, boats, mowers, automobiles, 4x4s and RVs. Rigid and flexible extensions allow for easy access to hard-to-reach areas.