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Female Gilbert Plugs SPT-2 (with Knockout Tab)
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$695.00
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Built for installers. Used on real jobs.
This is the gear working contractors run on real rooflines. C9 and C7 LED bulbs, socket wire, clips, plugs, and complete pro light kits at contractor wholesale pricing. Most orders ship same day if placed before 2 PM ET. Free shipping over $349.
The 4-sentence answer
The Female Gilbert Plug SPT-2 (with knockout tab) is the line-end connector that lets you chain a downstream stringer OR cap the end of a SPT-2 run. The knockout tab is removable — pop it out to chain another segment, leave it in to cap the line. Same UL-rated slide-on construction as the male SPT-2 plug: insulation-displacement contact teeth bite through the wire jacket when the cover snaps. Match SPT-2 plugs to SPT-2 wire (0.045″ jacket) — never cross-match with SPT-1.
Verified specifications
Every value below is pulled from the printed bag label and the plugs cluster spec source. No marketing inflation.
| Plug type | Female (line-end / chain-end) |
|---|---|
| Wire spec | SPT-2 (0.045″ jacket) |
| Conductor | 18 AWG copper compatible |
| Knockout tab | Yes (removable for chaining downstream) |
| Connection method | Slide-on with insulation-displacement contact |
| Voltage rating | 120V AC |
| Amperage rating | 10A |
| Pack size | See variant options |
| Certification | UL Listed |
Who this plug is built for
Contractor cutting custom-length runs from 1,000 ft spools
The volume use case. A 1,000 ft SPT-2 bulk spool supports 4–8 medium residential properties when you cut to length. Each custom run needs one female plug at the supply end and a fefemale plug at the line end (capped if it’s a single stringer; with knockout tab if you’re daisy-chaining). 50/Pack covers ~25 single-stringer runs; 1,000/Case is the contractor inventory base for a busy season.
Mid-season replacement of damaged factory plugs
When a factory plug on a pre-built stringer gets damaged (animal chew, lawn-equipment cut, water ingress), splice in a Gilbert Female SPT-2. Cut back to clean conductor, slide on the Gilbert, crimp down. Mid-season repair takes 30 seconds vs returning the whole stringer for warranty.
Build-your-own kit assembly for new install crews
Teaching new crew members to assemble custom stringers from bulk SPT-2 + Gilbert plugs is a skill multiplier — one trained installer can build custom-length stringers for the rest of the crew to hang. 50/Pack is the apprentice training set; once they’re fluent, the crew transitions to 1,000/Case inventory.
What this plug works with
- Wire
- SPT-2 socket wire (0.045″ jacket) ONLY. Don’t cross-match to SPT-1 (0.030″ jacket) — the slide-on plug fits too loose, the vampire spike doesn’t bite the conductor cleanly, and you’ll see corrosion or arcing within a season. Use the matching Male Gilbert Plug SPT-1 on SPT-1 wire. Shop SPT-2 socket wire
- Line-end partner
- Female Gilbert Plug SPT-2 with knockout tab (for daisy-chain ends) or Female Gilbert Plug SPT-2 without knockout tab (for final terminating ends). The full Gilbert SPT-2 family covers both daisy-chain and terminate-here line ends. Shop Female Gilbert SPT-2
- Extension cords
- Any standard 120V outdoor extension cord with a polarized female outlet. The Gilbert Male plug seats into the cord like any standard 2-prong line-voltage plug.
- Bulbs and clips
- Independent of plug spec. The plug terminates the wire; bulb brand and clip type are independent choices on the stringer.
- Will NOT work with
- SPT-1 socket wire (use SPT-1 female plug instead). Mini-light pre-built strings (those use molded factory plugs, not vampire-spike Gilberts). C9 or C7 sockets directly (the plug terminates wire, not sockets).
Female SPT-2 (knockout) vs Female SPT-2 plugs
| Spec | Female SPT-2 (knockout) | Female SPT-2 |
|---|---|---|
| Position on line | Downstream / line-end | Upstream / supply-end |
| Chains another segment? | Yes (pop the knockout tab) | No |
| Wire spec | SPT-2 only | SPT-2 only |
| Connection method | Slide-on IDC | Slide-on IDC |
| Best for | Line-end cap OR chain point | Supply end of every C9/C7 stringer |
See all Gilbert plug variants side by side →
How to install
- Cut the SPT-2 socket wire to length and trim the end square. Use sharp scissors or wire cutters. Cut straight across the jacket so both conductor strands are even — a slanted cut makes the vampire spikes bite one conductor before the other and produces an unbalanced connection.
- Slide the wire into the Gilbert Female SPT-2. The plug body has a slot that accepts the SPT-2 jacket. Push the wire in until it’s fully seated — the jacket should bottom out against the back of the plug body. Don’t leave the wire short-inserted, the spikes won’t reach both conductors.
- Crimp the plug shut with hand pressure or pliers. Press the two halves of the plug body together until they snap closed. The vampire spikes pierce both jacket and copper conductor simultaneously, making the supply connection. Test the line by plugging into a GFCI outlet — full string should light. If only half the string lights, the wire was cross-aligned in the plug body; cut back and re-terminate.
Certifications and compliance
- Gilbert brand — industry-standard SPT plug — The vampire-spike Gilbert topology is the contractor industry default. Compatible across all SPT-rated socket wire from any manufacturer that meets the SPT-1 or SPT-2 spec.
- Polarized 2-prong line voltage — One prong wider than the other, matching standard US polarized outlets. Prevents reverse-polarity insertion that could energize the neutral side of the line.
- SPT-rated jacket / 18 AWG conductor compatibility — Designed for 18 AWG copper conductor inside SPT-1 or SPT-2 jacket. Don’t use with non-SPT wire (different jacket cross-section won’t seat properly).
- Outdoor seasonal use — Same UV and freeze-thaw tolerance as the matching SPT-2 wire jacket. For permanent year-round installs, step up to a sealed-gasket plug system.
Warranty
Manufacturer defect warranty on Male Gilbert SPT-2 Plugs from Christmas Lights HQ. Covers cracked plug bodies, misaligned spikes, or premature corrosion under normal install conditions.
Not covered: plugs cross-matched to SPT-1 wire (wrong jacket spec), plugs installed on cut conductor that wasn’t square, water pooling at the plug seam (use drip loops on outdoor chains), animal damage, attempts to splice non-SPT wire into the plug.
Full warranty terms → | Warranty claim contact →
Questions contractors actually ask
What's the knockout tab for?
The knockout tab is the small plastic dimple on the fefemale plug body. Leave it in to cap the end of the line (final stringer in a chain). Pop it out (with pliers) to expose a male-plug socket so you can chain another downstream stringer to extend the run.
Can I use this plug on SPT-1 wire?
No. SPT-2 plugs only fit SPT-2 wire (0.045″ jacket). The contact teeth on this plug are sized for the thicker SPT-2 jacket; using on SPT-1 (0.030″) gives loose, intermittent contact and damages the teeth.
How many stringers can I chain end-to-end with these?
Per code, stay under 80% of circuit capacity (1440W on a 15A circuit). At 0.78W per C9 bulb, that's ~1,800 bulbs across all chained stringers. Most contractors split the chain at 500-800 bulbs per supply point for serviceability.
Will the knockout-tab feature wear out from repeated install/takedown?
No — the knockout tab is designed to be removed once at first install. After it's popped, the plug stays in chain-mode for the life of the install. Reinstalling the tab is not supported.
Customer reviews
Build the complete SPT-2 plug line
Orders placed before 2 PM ET ship the same day. Free shipping on orders over $349. Most orders arrive in 2-5 business days via UPS or FedEx Ground.