Help Identifying USD EARLY First Stage and Parts
Posted: Sat Sep 16, 2023 8:45 pm
I have what I believe is a early year USD single hose first stage that I can't ID. It has 1 3/8" HP port and 2 LP 3/8" ports. When I opened it up I found it in near perfect condition in internally. However I noticed the main spring for IP adjustment is actually 2 springs (one that is skinny and one that is similar to the Conshelf, the skinny spring sits INSIDE the fat spring). Then I opened the HP side and found a square HP seat which looks similar to the Mistral however it isn't as long and the center is not indented like the Mistral for the pin. Does anyone know what model first stage this is, and most importantly what HP seat I should be looking for as a replacement? The diaphragm appears to be the same as the Conshelf, there is no spring block like the Conshelfs have however. Attached pictures.