This cup is compatible with your Sprayfine or other brand HVLP turbine spray gun.  Under EPA rules (see below), this 3 oz cup along with the spray gun will exempt you from EPA regulation of your mobile paint spraying/refinishing.  This cup will adapt a siphon feed gun to gravity feed.

EPA rule:

In accordance with 40 CFR §63.11170(a)(2), an owner or operator of a motor vehicle or mobile equipment surface coating operation (including refinishing operations) may petition the United States Environmental Protection Agency (EPA) Administrator to exempt the operation from the surface coating regulatory requirements of 40 CFR Part 63 Subpart HHHHHH, if the owner or operator can demonstrate that the spray-applied coatings used by the facility do not contain target hazardous air pollutants (HAP) (paint stripping requirements still apply). Note: in determining whether you spray apply target HAP containing coatings, do not include coatings applied using handheld aerosol cans, or hand-held devices (e.g., spray guns) with a paint cup capacity of 3 fluid ounces or less. These are not considered spray-applied coatings under the rule. See, “spray-applied coating operations” definition at 40 CFR §63.11180.