The connection angle is at the industry standard 60° down angle from vertical that most brands of siphon, suction, or bottom feed single-action airbrushes use. The adaptor connection size is also at the industry standard 1/5" (5mm) size that friction-fits into the airbrushes fluid inlet. The adaptor lid assembly is compatible to fit most popular single-action siphon, suction or bottom-feed airbrush brands including Master, Iwata, Paasche, Badger, Etc...