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The only key here that names a serial number

Manruta MRT RFID collar tag, 2 pack

Two waterproof epoxy RFID collar tags for SureFlap and SureFeed, at $5.50 each — with a stated serial-number cutoff and a stated incompatibility.

Manruta pair of blue round RFID microchip collar tags for pets

Manruta MRT RFID collar tag, 2 pack

Two waterproof epoxy RFID collar tags for SureFlap and SureFeed, at $5.50 each — with a stated serial-number cutoff and a stated incompatibility.

Tags in the pack
2
Price per tag
$5.50
Diameter
1.1 in
Weight
2.8 g (0.1 oz) each
Material
Waterproof epoxy
Power
None — passive RFID
Stated compatibility
SureFlap Microchip Pet Door, Cat Door, DualScan Cat Door, SureFeed feeder
Serial threshold
Cat Door serial numbers above 1152201
Stated incompatibility
PetSafe products
Read range
Not published
Amazon reference
B07T5D43RQ
EAN
0717877418370
  • Publishes a serial-number threshold, which can be checked on the door you already own
  • Writes down the brand it will not work with, in its own capitals
  • No read range published

Best for: A SureFlap door whose cat has no readable chip, or a second animal to add

Check price on Amazon

Specifications

Tags in the pack
2
Price per tag
$5.50
Diameter
1.1 in
Weight
2.8 g (0.1 oz) each
Material
Waterproof epoxy
Power
None — passive RFID
Stated compatibility
SureFlap Microchip Pet Door, Cat Door, DualScan Cat Door, SureFeed feeder
Serial threshold
Cat Door serial numbers above 1152201
Stated incompatibility
PetSafe products
Read range
Not published
Amazon reference
B07T5D43RQ
EAN
0717877418370

What you are getting

Two RFID collar tags, 1.1 inch across and 2.8 grams each, in waterproof epoxy, for SureFlap doors and SureFeed feeders. $10.99 — $5.50 a key, the cheapest on this shelf.

It publishes a serial number, and nothing else here does

The fitment line reads: compatible with the SureFlap Microchip Pet Door, Cat Door, DualScan Cat Door and SureFeed Microchip Pet Feeder — “serial numbers higher than 1152201 on the Cat Door”.

That is a threshold you can check on the unit already screwed into your door. Every other key on this shelf names products; this one names the version. It is the most useful fitment statement in the group.

And it writes down what it will not open

“NOT compatible with PetSafe products”, in the listing’s own capitals. The PetSafe key on this shelf is the other half of that sentence — $24.93, battery-powered, and for a different door entirely.

Two keys, two ecosystems, no overlap. Buying the wrong one leaves a tag the door will never read.

Why a tag rather than the chip in the neck

The maker is explicit: “for use with pets that do not have an implanted microchip, or microchip can not be scanned well”. That second case is the common one — a chip that has migrated or sits deep reads unreliably at a flap, and a collar tag puts the code where the antenna is.

It also claims a “better signal getted than small built-in microchip”, which follows from size: an epoxy disc of 1.1 inch carries a larger coil than a glass chip the size of a rice grain.

What is not published

No read range, no battery (there is none — the tag is passive), and no stated lifespan. Instructions are not in the box: “located in the SureFlap/SureFeed manual”.

Availability

Read on the day this page was built: $11 at the American Amazon shop.

Read from Keepa on the day this page was last revised; stock and price both move without notice.

Prices quoted in this text were read on 2026-10-06. The live price is at the top of the page.

The questions owners ask

Why use a collar tag when the cat already has a microchip?

Because the chip does not always read. The maker states the two cases: pets "that do not have an implanted microchip, or microchip can not be scanned well". A chip that has migrated from the shoulder or sits deep gives an unreliable read at the flap, and a cat that has to stand still twice stops using the door. A 1.1-inch epoxy disc on the collar puts a larger coil right where the antenna is.

What is the serial number about?

SureFlap changed the Cat Door at a point in production, and the tag works with units above serial 1152201 only. The number is on the unit. This is the single most checkable fitment line on this shelf — every other listing names products, which can be ambiguous across generations, where a serial threshold cannot.

Will it work on a PetSafe door?

No, and the listing says so in capitals: "NOT compatible with PetSafe products". PetSafe sells its own key on this shelf — a battery-powered RFID unit at $24.93 — and the two systems do not read each other. This is the check to make before ordering: the door decides the key, not the other way round.

Products this fits

More door tags & tunnels

  • Sure Petcare RFID collar tag for microchip cat flaps

    Sure Petcare RFID collar tag

    An RFID tag for the collar, working with SureFlap microchip flaps and pet doors, SureFeed microchip feeders and Felaqua Connect — the fallback when a chip reads badly.

    Works with
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    Function
    Selective access without relying on the implanted chip
    Amazon reference
    DE B00B5BEK54 · US B018F2HSFO · GB B018F2HSFO · FR B018F2HSFO · IT B018F2HSFO · ES B018F2HSFO
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    • Solves the one failure mode of a microchip door — a chip that has migrated or reads intermittently
    • Works across the whole Sure Petcare range, including the feeders
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  • SureFlap tunnel extender three pack in white

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    Material
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    Amazon reference
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  • SureFlap 50 mm tunnel extender for microchip cat flaps

    Sure Petcare Tunnel extender, 50 mm

    A 50-millimeter tunnel extension for SureFlap cat flaps, compatible with the standard, DualScan and Connect models.

    Adds
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    Compatible with
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    Amazon reference
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    EAN
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    • Turns a flap designed for a door into one that fits a wall
    • Stackable: several extenders cross a thick wall
    • Proprietary — nothing else fits properly, and a badly sealed tunnel is a draft

    Best for: Fitting a SureFlap into anything thicker than a door panel.

    ≈ $21
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Elsewhere in the cupboard

  • OPISICEN set of cat fountain filters, sponges and two cleaning brushes

    OPISICEN OP-00003, 34-piece set

    A 34-piece set for 2 L, 2.8 L and 4 L fountains, stating plainly that it does not fit 84 oz / 2.5 L, with two pump brushes included.

    Filters
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    Sponges
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    Brushes
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    Price per filter
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    Filter size
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    Sponge size
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    Stated fitment
    95 oz / 2.8 L, 67 oz / 2 L, 135 oz / 4 L
    Stated incompatibility
    84 oz / 2.5 L
    Layers
    Activated carbon, ion exchange resin, non-woven fabric
    Change interval
    Every 2 to 4 weeks
    Amazon reference
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    EAN
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    • The clearest capacity exclusion on this shelf — it names the size it will not fit
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  • PETLIBRO replacement filter and sponge set for Dockstream cat fountains

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    Sponges
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    Price per filter
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    Stages
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    Change interval
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    Set duration
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    Preparation
    Soak 5 minutes, rinse 30 seconds
    Packaging
    Filters and sponges packed individually
    Filter dimensions
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    Amazon reference
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    EAN
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    • Six model numbers named, the most precise fitment statement on this shelf
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    A 24-piece set with a pump cleaning brush for 95 oz / 2.8 L fountains, at $1.33 per filter.

    Filters
    12
    Sponges
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    Brush
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    Price per filter
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    Filter size
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    Stated fitment
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    Preparation
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    Change interval
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    Sponge size
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    EAN
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    • Includes a pump brush, which reaches the part of a fountain a filter never does
    • Publishes the filter dimension, so it can be measured rather than guessed
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    Check price on Amazon

All door tags & tunnels