Better than electrical tape by far!
Used this on vehicles (starters) and trailer lights. Easy to use, looks like a professional fitting, and seems to hold tight.
Verified Buyer · Verified Purchase★ Verified
3:1 Dual Wall · 10ft Short Pack
2"
3:1 Heat Shrink
FitsMaximum size50.8mm
2 inch heat shrink tubing is the largest diameter in this line — a 50.8mm expanded bore that passes over heavy cable bundles, hose and pipe, and fully terminated 4/0 lug assemblies, recovering to roughly 16.9mm. That range is the whole point: one tube covers bundles that would otherwise need two or three sizes of 2:1. Unlike the single-wall 2 inch tube, this version is adhesive-lined, so it seals rather than merely covers — the hot-melt inner wall flows at 120°C into the gaps between conductors in a bundle, where water would otherwise track straight through. Use it on cable tray exits, outdoor enclosure penetrations, conduit terminations, and industrial cable assembly ends. UL 224, 600V, -55°C to +125°C, UV resistant. At this diameter a 10ft pack is genuinely a bulk quantity: most jobs consume two or three 8-inch pieces.
★★★★★4.7 · 225 verified ratings across the Helixal range
10 in stock · Ships in 24h
Order up to 10 online · need more? Trade pricing
Size2" · 50.8mm
Click any size to navigate · 10 ft per roll
$20.4910 ft spool
→ Dispatched within 24 hours — delivered in 1–3 days→ 30-day money-back guarantee — 30 days to return it
Qty
1
Secured by Stripe · No account needed
→Ships USA & Canada
→ISO 9001
→Ships 24h
SKU: B0FJNK4XJV · 2" (50.8mm) · 10 ft
Spec Sheet
2"
data sheet.
Full industrial dual-wall adhesive spec in a convenient 10ft pack. Same 600V rated, waterproof polyolefin construction as the large bulk rolls.
Imperial Size
2"
Expanded diameter
Metric Size
50.8mm
Nominal
Roll Length
10 ft
Per spool
Wire Gauge
Maximum size
Bare conductor
Shrink Ratio
3:1
Dual wall
Construction
Dual Wall
Adhesive inner liner
Inner Layer
Hot Melt Adhesive
Waterproof seal
Voltage Rating
600V AC
UL 224 — 600 V rms
Temp Rating
-55°C to +125°C
Continuous service
Shrink Temp
100°C (212°F)
Shrinking starts
Adhesive Flow
120°C (248°F)
Keep heating until it shows
Material
Polyolefin
Outer sleeve
Flammability
Self-extinguishing
UL 224 Recognized
Color
Black
Standard finish
Standards
UL 224 Recognized
UL file E361230 · RoHS
UV Resistance
Yes
Outdoor safe
Waterproof
Yes — adhesive seal
360° coverage
Sizing over a connector? The Wire Gauge row above is for bare conductor. Heat shrink must be sized to the widest point it passes over, so a crimped butt splice or lug barrel needs a larger tube than the wire alone — a 22–18 AWG splice barrel measures 5–6mm, a 16–14 AWG barrel 7–8mm, and a 12–10 AWG barrel 9–11mm. Measure the barrel, allow about 20% clearance, and confirm the recovered diameter is smaller than the narrowest thing the tube must grip. Use the size calculator.
What the
trade says.
Verified Buyers ★ · Full Range4.7★★★★★225 ratings · 84% 5-starCombined verified-buyer rating for every Helixal product — all ratios, all sizes — not this size alone.
Good quality and sealing heat shrink
Heat shrink works good. Makes a nice sealed wire connection. Better than pre-cut heat shrink — you can make whatever length you want.
R Davis · Verified Purchase★ Verified
Smart format for repair work
Great for keeping several sizes on hand without the bulk. Same quality as the large rolls — the adhesive seals perfectly every time.
Travis M. · Verified Purchase★ Verified
Customer Reviews
Loading reviews…
Sizing & Application — 2 inch, 10ft pack
At fifty millimetres, ten feet is not a short roll. It is fifteen jobs.
2 inch (50.8mm) is the largest diameter in the line, recovering to roughly 16.9mm — a span that covers bundles which would otherwise need two or three sizes of 2:1. The word "short" stops meaning much up here. A piece at this diameter is 6 to 8 inches long, most jobs use two or three of them, and ten feet is therefore a genuine bulk quantity rather than a sample.
Piece count, not roll length, is the number that matters
It is natural to compare roll lengths across sizes and conclude that ten feet is small. That comparison does not survive contact with the work. Ten feet of 3/32 inch is about sixty fine-gauge repairs; ten feet of 2 inch is roughly fifteen to twenty pieces at the length this diameter is actually cut to. Both are a year of their respective jobs.
What consumes 2 inch tubing is cable tray exits, outdoor enclosure penetrations, conduit terminations and industrial cable assembly ends. A large penetration takes one piece. A tray exit takes one. Even a substantial job rarely uses more than three, because at this diameter you are covering a small number of large things rather than a large number of small ones.
The adhesive is what makes those pieces worth fitting. A bundle at this size has deep valleys between its conductors, and a tube that merely covers them leaves channels running end to end — a path that can carry water into the enclosure the penetration was meant to protect. The hot-melt liner flows at 120°C and the recovering wall presses it into those valleys until the section is solid.
2 inch short pack at a glance
| Property | Figure | Why it matters |
|---|---|---|
| Expanded diameter | 50.8mm (2") | Passes over heavy bundles, hose and pipe, terminated 4/0 assemblies |
| Recovered diameter | ≈16.9mm | A third — covers what two or three 2:1 sizes would need |
| Typical piece length | 6–8 in | One per penetration or tray exit |
| Pack yield | ≈15–20 pieces | Several jobs, and stock for the next call-out |
| Wall type | 3:1 dual wall, hot-melt lined | Fills the valleys between conductors instead of bridging them |
| Ratings | UL 224 Recognized, UV resistant | Suitable for outdoor and wet-location penetrations |
Let the tube overlap solid jacket at both ends. Adhesive needs a continuous surface to bond to, or the seal stops where the bundle opens out.
When 2 inch is not the answer
01 · The item is under about 18mm
The recovered wall will not close onto it. Drop to the 1-1/2 inch pack, whose floor is about 12.7mm.
02 · Dry covering and identification
Where nothing needs sealing, the 2" 2:1 covers and protects at a lower cost per foot; the adhesive would be paying for a property the job never uses.
03 · You fit this size weekly
The 20ft roll is the cheaper way to hold it at that rate. The pack is for the few-times-a-year pattern this diameter usually has.
04 · Above 600V
Rated 600V rms. On a 1000V circuit the conductor insulation carries the rating and this tubing seals over it rather than insulating.
Keep reading →2" 3:1 Dual Wall — 20ft bulk roll · 1-1/2" 3:1 Dual Wall — 10ft pack · Heat Shrink Tubing: The Complete Guide
How it shrinks.
01
Measure & Select
Verify the expanded diameter is 20–30% larger than your wire or connector. The tubing must slide freely before heat is applied — if it drags, go one size up.
02
Cut & Thread
Cut to length and thread onto the wire or cable before making the splice or crimp. Overlap each terminal or connector end by at least 10mm for a proper seal.
03
Apply Heat
The tubing starts shrinking at 100°C, but the adhesive liner only flows at 120°C — so keep the heat gun moving past the point where it looks shrunk. Start at the center and work outward to push air toward the ends. Adhesive will appear at the tube ends — that is your visual seal indicator.
04
Inspect
The tubing should be tight and uniform with adhesive visible at both ends. No gaps, lifting, or cold spots. Pull-test the finished connection to confirm the adhesive bond.
Size ReferenceExpanded vs.
Expanded vs.
recovered.
Actual 2" tube at full expanded diameter (50.8mm) and after heat recovery. Use this as your fit reference before cutting.
Expanded: 50.8mm — slides over Maximum size
Shrink ratio: 3:1 on full heat
Use it on.
01
Try Before You Buy Bulk
Order a 10ft pack to verify the size fits your connector before committing to a large roll. Test fit, shrink one piece, then buy the bulk roll with confidence.
02
Field Repair Kits
Keep a set of short rolls on the service van or boat. Enough for any repair job without hauling large rolls — one 10ft roll handles most splices.
03
Stock Multiple Sizes Cheap
For the same cost as one large roll, stock several different sizes in short packs. Covers more connector diameters for the same investment.
04
Marine & Outdoor Spot Repairs
Seals individual connections on boat wiring, outdoor electrical, and trailer harnesses. Same waterproof adhesive seal as the large rolls — just 10ft.
05
Low-Volume Production
Ideal for small-batch cable assembly and prototype builds where a full bulk roll would sit unused. Cost-effective for runs of fewer than 50 connections.
06
One-Off Automotive Builds
Custom automotive and motorcycle builds often need several sizes in small quantities. Short rolls let you match every connection without leftover material.
Size Guide
2" Questions.
Technical Guides
All Guides →From the Blog
Free Tool
Heat Shrink Size Calculator
Read Guide →Ratios2:1 vs 3:1 vs 4:1 Heat Shrink Ratio Guide
Read Guide →Complete GuideHeat Shrink Tubing: The Complete Guide
Read Guide →SizingSize Chart & Selection Guide
Read Guide →How-ToHeat Shrink for Battery Terminals
Read Guide →AutomotiveAutomotive Wire Protection Guide
Read Guide →Also available — 2" in other lines
All 13 sizes.
View line overview →3/32"2.4mm10 ft1/8"3.2mm10 ft3/16"4.8mm10 ft1/4"6.4mm10 ft5/16"8mm10 ft3/8"9.5mm10 ft1/2"12.7mm10 ft5/8"16mm10 ft3/4"19.1mm10 ft1"25.4mm10 ft1-1/4"31mm10 ft1-1/2"38mm10 ft
Current2"50.8mm10 ft
Recovered diameter is approx. 1/3 of the expanded size shown · All sizes ship to USA & Canada