Our Solo 408CI is a stainless steel . 3.5 Gallon unit with Teflon impregnated Viton seals, that is not only resistant to acetone, but to solvents as well. These have heavy-duty brass shut-offs, wands, and nozzles. The pump is a high volume brass pump. Used for dying cement and stained concrete as well as many other industrial uses. Also marketed as the Xtreme Sprayer The 408-CI X-Stream is designed to handle curing compounds that have a strong solvent base.