Try TCS...
In-Line Connectors Link
I use mostly their 1309 6-pin for both DCC installations and as an in-line connector for 6-wire O gauge accessories that seem to require service/maintenance, such as certain road crossing gates/flashers.
They don't have 10" leads of #22 wire, though, and I think you'll find those harder to find...not sure even TCS has anything stocked like that. The wire size in their in-lines is typically 32-gauge...plenty for the current capacity of most of the applications I use them for.
They have a lot of variations though....very small package sizes, too.
FWIW, always...
KD