22-Position SL Receptacle Housing — What You're Working With
The 0022552221: It's a free-hanging (in-line) shell that accepts crimp female socket terminals — you build the harness, then mate it to a matching SL header.
A common BOM mistake is counting this as a complete connector; it's the shell only, so budget for the terminals and the crimp tooling if you don't already have it.
Pitch and Position Count — Fit Check
If your board layout calls for a 22-circuit SL header, this is the receptacle half that completes the wire-to-board connection.