The FireMaster 400g VeeMap Map Style Gas Cylinder is a small, portable gas canister designed primarily for use with brazing torches, camping stoves, portable heaters, and other small appliances that require a gas fuel source. It uses a specific valve system that ensures a secure connection and a reliable flow of gas.

The 400g refers to the weight of the gas inside the cylinder, indicating it's a relatively small, lightweight option. This gas cylinder contains Mapp gas, which is burns hotter than Propane gas making it a better alternative for soldering and brazing.

Key features include:

1. Size & Portability: At 400g, it is small enough for easy transport and storage.
2. Use Case: It is typically used for soldering / brazing in plumbing installation, camping, hiking, or other outdoor activities where compact and reliable fuel sources are necessary.