[quote=5thAve]Is that part with the arrow similar to the same one that looks like it on the other side with the green end? I haven't seen those on any compressor I've dealt with before and hard to see from the pics what they are.[/b]

The green one on the left looks the same but it has different specs on it. It says PT15 bar PN25 D .6mm Q3338 I.min The black one says PT 4 bar PN 25 D .6 mm Q1038 I.min They air both Air Tek brand.