I have a gauge, but what fitting do I need to attach to a 1" 20LT bushing where the meter attaches? a regular 1" union does not work.

Hi Kneasfe and welcome to the Plumbing pageat at AskMeHelpDesk.com. You piggybacked on an a 6 year old thread so I gave you one of your own. First explain to me what a 20LT bushing is. I'm not sure what you're asking. You're going to have to furnish more details here. You're attempting to go from what to what? I just don't have enough information to start a answer much less a solution. Back to you, Tomn