We had one here in Waterford CT the closed sometime on the mid to late 80's (visited a few times) and there was Chet's Speed shop in Preston that closed 10 or 15 years ago. He was a Chevy guy but great sense of humor and a great place to pop in and get AN fittings. Was at all three of his locations before he shut down for good.

The nearest place now is in Gilford? Near New Haven that I'm aware of. Had a few bottles filled there, but a long drive. Stopped at the old Don's location on the Pike years ago, WOW did he have a bunch of old school stuff! I hear it burned down several years ago, very sad.