Attention! there are at least two possibilities. It has no threaded connection. If your original is identical to mine, it doesn't unscrew, so assume it's a snap-on version. Maybe it's *not* the snap-on version, it's the threaded version, and it's too corroded to unscrew. When I surgically opened mine I found a brass nut that was spinning in the plastic case when I tried to unscrew it. Your life will likely be a lot easier if you just order the version with the removable brass insert; this should work with any version. I only gave 3 stars because tech support was very helpful in directing me to a "retail" site with a parts list. Nothing more than that, because AS have no exploded views/parts lists on their own website, no part numbers on their parts, apparently multiple versions of the same device that cannot be distinguished from one another by documents, etc. ie if it weren't like that. If there's a polite, helpful person to help over the phone, that would be a start.
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