This is a black DC power jack. This has an internal switch which will disconnect the battery power when an AC to DC power adapter is connected. The outside diameter is 5.5mm. Fits standard BOSS-style power supplies with 2.1mm diameter plugs. This is the style with the internal nut.
Available in an economic 10-pack or 20-pack.
This item ships via USPS First Class Mail with tracking unless ordered with a pedal kit.