Scotch Locks & T-TAPs are available in three wire gauge sizes: 22-18 Gauge (Red Body), 18-14 Gauge (Blue Body) and 12-10 Gauge (Yellow Body).
Scotch Locks allow you to tap into an existing wire quickly and easily. The plastic folding flap should lock into place when properly assembled.
T-TAPs perform a similar function but also accommodate a 1/4" male spade connector, inserted perpendicular to the wire being tapped.