It does look like a Molex KK series, but it is probably a
KK 254 (0.1") series connector, not a KK 396 (0.156") series connector.
Break out the calipers and measure from the tip of pin 1 to the tip of pin 4.
- 0.3" = 0.1" pitch = Molex KK 254 (or
possibly a Dupont connector like the ones used on motherboards, cooling fans, breadboard jumpers, etc.)
- 0.468" = 0.156" pitch = Molex KK 396
Twisty Wrist has a KK 254 4-pin housing
here (Molex P/N 22-01-2047) and female pins
here that will work with Molex headers #
6373,
6410, or
171856.
Scott