The velocity of feedstock through the internal passages of the adapter and body are much lower than the velocity through the swirl and orifice and, as a result, wear rates are much lower. The adapter is attached to the feed pipe either by welding or by tapered pipe threads.
The body is connected to the adapter with non-sealing, parallel threads. Several types of bodies are available, for example the standard and the cone face version.
For maximum safety you might consider our Fire Safety Atomizing Nozzles.