49ZY55 METACAULK Firestop Pipe Collar for 2 in Plastic Pipes: Worldwide Buyer's Guide (2 hr/3 hr Rated)
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The 49ZY55 METACAULK Firestop Pipe Collar is a 2 in plastic-pipe firestop device rated 2 hours in gypsum wall and wood assemblies and 3 hours in wall and floor assemblies. It locks around the pipe at the penetration, expands under fire heat to crush and seal the softening plastic pipe, and restores the fire-resistance rating of the barrier.
What is a firestop pipe collar?
A firestop pipe collar is a prefabricated intumescent device that wraps a combustible or metal pipe at the point it passes through a fire-rated wall or floor. When heated, the intumescent material expands many times its original volume, closing the annular gap left as the pipe softens or burns away, so flame and smoke cannot pass through the penetration.
METACAULK collars are supplied as complete, listed assemblies with a locking tab for fast installation — no field-fabricated wraps or mastic build-ups required. That prefabrication is the main reason specifiers choose them over site-built systems: the tested configuration is fixed, so the installed system matches the tested system.
How does the 49ZY55 collar work?
The collar is fastened around the pipe where it penetrates the rated barrier. In a fire, the intumescent insert expands and presses against the pipe wall. Because the plastic pipe softens at relatively low temperature, the expanding material closes the pipe bore and the annular space simultaneously, forming a dense char that blocks the opening.
The result is a maintained fire barrier rather than a hole through it. The same mechanism applies across the METACAULK plastic-pipe range, from 1.5 in up to 6 in pipe sizes.
49ZY55 key specifications
| Attribute | Value |
|---|---|
| Manufacturer | METACAULK |
| MPN | 66353 |
| 3G Electric SKU | 49ZY55 |
| Pipe type | Combustible plastic pipe |
| Nominal pipe size | 2 in (50 mm nominal) |
| Fire rating — gypsum walls / wood assemblies | 2 hours |
| Fire rating — wall and floor assemblies | 3 hours |
| Activation | Intumescent expansion under heat |
| Installation | Locking tab, prefabricated assembly |
| Currency for pricing | USD |
Ratings are assembly-specific: the 2-hour and 3-hour figures apply to the tested wall and floor constructions, not to the collar in isolation. Always match the collar to the listed assembly in the project specification.
Which pipe sizes and variants are available?
METACAULK plastic-pipe collars cover 1.5 in, 2 in, 3 in, 4 in and 6 in nominal pipe, plus round intumescent sleeves for larger plastic and metal pipe. Metal-pipe penetrations use a different product family — the universal collar and round intumescent sleeve — because metal does not soften the way plastic does.
- 1.5 in plastic pipe — METACAULK Firestop Pipe Collar for 1.5 in Plastic Pipes
- 2 in plastic pipe — METACAULK Firestop Pipe Collar for 2 in Plastic Pipes
- 3 in plastic pipe — METACAULK Firestop Pipe Collar for 3 in Plastic Pipes
- 4 in plastic pipe — METACAULK Firestop Pipe Collar for 4 in Plastic Pipes
- 6 in plastic pipe — METACAULK Firestop Pipe Collar for 6 in Plastic Pipes
- 4 in plastic pipe, round sleeve, 3-hour — METACAULK Round Intumescent Sleeve for 4 in Plastic Pipes
- 8 in metal pipe, universal collar — METACAULK Universal Firestop Collar for 8 in Metal Pipes
- 8 in metal pipe, round sleeve, 3-hour — METACAULK Round Intumescent Sleeve for 8 in Metal Pipes
Where are firestop collars used in Worldwide projects?
Plastic-pipe firestop collars appear wherever DWV, drainage, condensate or process plastic pipe crosses a rated barrier: high-rise residential and hotel stacks, hospital and laboratory drainage, data-centre condensate lines, and industrial plant rooms. In export markets, the same collar is specified against locally adopted fire test standards, so the tested assembly documentation matters as much as the hardware.
For international buyers, the practical questions are pipe outside diameter (metric pipe is often specified in mm, not inches), barrier construction, and whether the local authority accepts the listed assembly. 3G Electric supplies these collars worldwide with export documentation and can confirm the correct size against your pipe schedule.
How to select the right firestop collar
- Confirm pipe material. Combustible plastic pipe uses the plastic-pipe collar range; metal pipe uses the universal collar or round intumescent sleeve.
- Measure the pipe outside diameter, not the nominal size. A 2 in nominal plastic pipe may not measure 2 in OD — verify against the manufacturer's pipe data before ordering.
- Identify the barrier type. Gypsum wall and wood assemblies carry the 2-hour rating; wall and floor assemblies carry the 3-hour rating.
- Check the required fire-resistance period. Match the collar rating to the barrier's required rating, not to the building's overall rating.
- Confirm the listed assembly. The collar must be installed in a tested configuration; deviations void the rating.
- Plan quantity per penetration. Some assemblies require a collar on each side of the barrier — confirm against the listing.
- Allow for export lead time. International orders need documentation and freight planning; confirm lead time at quotation.
Product comparison: METACAULK firestop collars
| Product | Pipe type | Nominal size | Rating | Best for |
|---|---|---|---|---|
| METACAULK Firestop Pipe Collar for 1.5 in Plastic Pipes | Plastic | 1.5 in | 2 hr gypsum/wood; 3 hr wall/floor | Small-bore drainage and condensate lines |
| METACAULK Firestop Pipe Collar for 2 in Plastic Pipes | Plastic | 2 in | 2 hr gypsum/wood; 3 hr wall/floor | Standard DWV and process plastic pipe |
| METACAULK Firestop Pipe Collar for 3 in Plastic Pipes | Plastic | 3 in | 2 hr gypsum/wood; 3 hr wall/floor | Mid-size drainage stacks |
| METACAULK Firestop Pipe Collar for 4 in Plastic Pipes | Plastic | 4 in | 2 hr gypsum/wood; 3 hr wall/floor | Main soil and waste stacks |
| METACAULK Firestop Pipe Collar for 6 in Plastic Pipes | Plastic | 6 in | 2 hr gypsum/wood; 3 hr wall/floor | Large-bore drainage and process lines |
Step up the ladder as pipe diameter increases: the 1.5 in and 2 in collars suit branch and condensate lines, while 4 in and 6 in collars handle main stacks. If the penetration is metal pipe rather than plastic, move to the universal collar or round intumescent sleeve instead — the plastic-pipe collars are not interchangeable with metal-pipe assemblies.
Why source firestop collars from 3G Electric?
3G Electric stocks 8 METACAULK firestop products and supplies across 14 industrial departments — far more than is listed here. With 35+ years of experience interpreting customer demand, we confirm the correct collar size against your pipe schedule and barrier type before quoting, rather than shipping the nearest match.
We supply worldwide with export documentation experience and incoterms-neutral arrangements, and our technical team supports sizing, assembly selection and substitution questions. Specialist depth in combustion, pumps and controls underpins the same disciplined sourcing approach we apply to passive fire protection.
According to the METACAULK Pipe Collar Product Data Sheet: "Metacaulk Pipe Collars are prefabricated for open and closed through-penetration firestop systems using 1 1/2 in (38 mm) to 6 in (152 mm) combustible plastic pipe. An easy locking tab assures quick and efficient installation."
Frequently asked questions
What is the 49ZY55 METACAULK firestop pipe collar used for?
The 49ZY55 collar seals 2 in combustible plastic pipe penetrations through fire-rated walls and floors. It is rated 2 hours in gypsum wall and wood assemblies and 3 hours in wall and floor assemblies, expanding when heated to close the opening and prevent flame and smoke spread.
What is the difference between the 2-hour and 3-hour rating?
The rating depends on the barrier, not the collar. In gypsum wall and wood assemblies the tested rating is 2 hours; in wall and floor assemblies it is 3 hours. Always match the collar to the listed assembly in your project specification.
Can I use a plastic-pipe collar on metal pipe?
No. Plastic-pipe collars such as the 49ZY55 are tested for combustible plastic pipe. Metal pipe penetrations require the METACAULK universal collar or round intumescent sleeve, which are separate listed assemblies.
How do I confirm the correct collar size?
Measure the pipe outside diameter rather than relying on nominal size, then match it to the collar range from 1.5 in to 6 in. 3G Electric can verify the size against your pipe schedule before you order.
Do you supply METACAULK firestop collars worldwide?
Yes. 3G Electric supplies worldwide with export documentation experience and incoterms-neutral arrangements. Pricing is quoted in USD, and lead time depends on destination and order quantity — confirm at quotation.
How many collars are needed per penetration?
Some listed assemblies require a collar on each side of the barrier. Confirm the requirement against the specific tested assembly for your wall or floor construction before ordering quantities.
Key takeaways
- The 49ZY55 METACAULK collar fits 2 in plastic pipe and is rated 2 hours in gypsum/wood assemblies and 3 hours in wall/floor assemblies.
- Ratings are assembly-specific — match the collar to the tested wall or floor construction.
- Plastic-pipe and metal-pipe collars are not interchangeable; select by pipe material first.
- METACAULK plastic-pipe collars cover 1.5 in to 6 in nominal pipe, with round sleeves for larger sizes.
- 3G Electric supplies worldwide with sizing support and export documentation.
Need a quote or help matching a collar to your pipe schedule? Contact 3G Electric for sizing assistance, technical support and worldwide delivery on the full METACAULK firestop range.
