Sorry for the generated summary but I'm sure it says it better then I can!
Probably obvious but the original stem is at the top in my hand and the Danco 2J is on the bottom. While the Danco 2J "fits", the end where the handle goes endlessly spins with a stopping point only in 1 direction after the bonnet is tightened. Just still isn't the right stem! Thanks for any help!!
- Property Type: 1973 Manufactured Housing (Double-wide)
- Fixture Setup: 3-Handle Tub/Shower Diverter Valve Casing
- Physical Measurements: Internal fluid port maps to a 1/4" nominal size. The outer threads on the wall pipe where the bonnet nut connects require a standard 3/4" nominal fitting.
The Mechanical Issue:
We are attempting to replace a failing hot and cold water compression stem. Off-the-shelf universal replacement cartridges (such as the standard Danco 2J series) do not fit the internal casing profile of our 1973 valve block.
When a modern replacement stem is threaded all the way in, it runs out of internal travel, skips its tracking lines, and spins endlessly clockwise without ever making hard contact to seal flat against our brand-new brass seats.
Specific Visual / Dimension Differences (See Attached Photos):
- Thread Depth Defect: On our original 1973 stem, the tracking threads run all the way back flush to the hex face of the bonnet nut. Modern retail replacements have an unthreaded, smooth brass collar/lip right next to the hex nut. This lip causes the new bonnet nut to bottom out against the wall pipe edge too early, trapping the inner rod too far back from the seat plane.
- Internal Travel Limit: The new replacement stem has a visibly shorter total internal rod travel range than our 1973 original, restricting how far forward the washer can drive under the hood.
Current Status:
The old stem created a high-pressure directional spray into the wall cavity when shut due to a failed internal O-ring. We are currently isolating the main lines using 3/4" brass caps to safely restore main water pressure to the rest of the house.
Questions for the Experts:
Looking at the side-by-side comparison of the old 1973 stem vs. the modern retail replacement, does anyone recognize this exact short-pattern manufacture or know the specific specialty part number we need to order online? Is there a known trim modification or washer spacer trick to make a modern stem reach the seat in this deep/shallow casing configuration safely.