Honeywell 1TL1-3D Manufacturer: Honeywell Switch Type: 2-position round-top locking toggle Datasheet: Honeywell tl series switches Substituts: 1NT prefix (single-pole) and 2NT prefix (double-pole) can substitute for 1TL prefix anywhere. The NT-series toggles are an industrial (not mil-spec) version of the same switch, and are typically much less expensive. For example, 1NT1-1 would substitute for 1TL1-1; 1NT1-3D would substitute for 1TL1-3D, and so on. 1TL1-2 prefix can substitute for 1TL1-3 prefix anywhere. 1TL1-2 is an ON/OFF actuation, instead of 1TL1-3's ON/ON actuation. 1TL1-6 prefix can substitute for 1TL1-8 prefix anywhere. 1L1-6 is an (ON)/OFF actuation, instead of 1TL1-8's (ON)/ON actuation. 2TL prefix (double-pole) can substitute for 1TL prefix (single-pole) anywhere, and vice-versa. Be aware that the 2TL double-pole toggles are slightly larger than the 1TL single-pole toggles.