LifeJacket Auto Capsules

(35 customer reviews)

From £2.07

All auto capsules, bobbins & pills will have a minimum replace by date of 2 years.

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UM (United Molders) MK5i Auto Cap

A screw on cartridge which activates on contact with water. This will replace the cap fitted to most SeaSafe Lifejackets. United Moulders Cartridge will fit all automatic lifejackets that use the UML Mk5 and UML Mk5i type inflator. life jacket capsules

UM Pro Sensor Auto Cap

Also a screw on cartridge which activates on contact with water. Pro Sensor Cartridges will fit all automatic lifejackets that use the UML Mk5 and UML Mk5i type inflator and also the Pro Sensor head.

  • The above cartridge mechanism’s has a compressed high powered spring which is held by a paper element. When the paper element dissolves it releases the spring which allows the firing mechanism to puncture the CO2 cylinder, the CO2 then travels through the manifold and inflates the lifejacket.
UM Pro Sensor Elite Auto Cap

A screw on cartridge which activates on contact with water. The inflator provides additional improvement on the standard MK5 Automatic Inflator, affording the user one point of status indication to confirm that the unit has been automatically or manually activated.

Halkey Roberts Bobbin

Also known as the ‘super bobbin’ fits all Halkey Roberts mechanisms.

The Bobbin is designed to disintegrate when exposed to water, this allows the firing mechanism to puncture the CO2 cylinder and fill the inflatable chamber. Install Bobbin with the white pill facing the cap of the inflator. The Bobbin Assembly will slide in easily if installed correctly. Bobbin must be stored in a cool dry environment (65 ºF to 85 ºF , 19 ºC to 29 ºC). To ensure consistent service from your manual/automatic inflator the bobbin should be changed at regular intervals or replace bobbin more frequently in certain conditions or if the life jacket has not been stored correctly.

Secumar Auto Pill

Is a soluble spare pills for all SECUMAR lifejackets with these firing mechanisms SECUMATIC 3001S, SECUMATIC 2000 or SECUMATIC 10. Each SECUMAR pill is individually weighed and tested for tolerances. So, for example, the weight tolerance is only 0.03 g (three hundreds of a gram). Any deviation in the consistency of the material would otherwise mean several seconds delay in activation of the lifejacket or in some circumstances non-activation of the lifejacket.

Suction Cap – Auto to Manual Converter

With Cord  – for use with Mk5i & Pro-Sensor (NOT Elite) UM auto capsule only. Using the suction cap with cord, you can quickly convert the operating mechanism from an Automatic to a Manual when needed for boarding Helicopters, or in enclosed areas,  etc…. The cap must to be removed once you are free from the enclosed jacket capsules

Blanking Cap

Converts UML MK5i head to a manually operated head. Remove MK5i cap from head and screw blanking cap on in replacement.

– life jacket capsules

Additional information

Weight 0.032 kg

UM MK5i Autocap, UM Pro-Sensor Autocap, UM Pro-Sensor Elite Autocap, Halkey Roberts Bobbin, Lalizas Bobbin, Secumar Auto Pill, Auto to Manual Converter, Blanking Cap


We recommend that you send your life jacket to us to be re-armed and re-packed.

We service a huge amount of life jackets each year and we see many incorrectly packed which can put lives at risk.

It is recommended that Life Jackets are serviced annually, for commercial operators they must be serviced every year.

If the life jacket has been serviced in the previous year we will not charge for the Re-Arm and Re-Pack process.

We only charge for replacement parts and carriage. If you use one of our Service points carriage is free.

If the life jacket has not been recently serviced we will perform a service, prices start from £10.79 (+vat).

If the life jacket needs any expensive replacement parts the customer will be advised prior to any work carried out.

If you drop your jackets off at a service point, carriage is free. This is the safest, simplest and hassle-free way of re-arming (or servicing) your life jackets.

<a href=”” target=”_blank” rel=”noopener noreferrer”>Click Here</a> for a list of Service Points.

35 reviews for LifeJacket Auto Capsules

  1. Peter King (verified owner)

    As described good value

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  2. Rex A. (verified owner)

    Good long life on auto capsule.

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  3. Simon Perks (verified owner)

    Great selection of capsules, so I was able to get exactly the ones I need. Even the little yellow bobbins!

    (1) (0)
  4. Anonymous (verified owner)

    Everything as ordered. Very quick delivery.

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  5. John Newman (verified owner)

    Perfect re-arming replacement

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  6. Anonymous (verified owner)

    As described

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  7. Robin (verified owner)

    Correct items delivered. Purchased them individually so I did not have to buy unnecessary items in a blister pack.

    (0) (0)
  8. Camp Kerala LLP (verified owner)

    As above

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  9. Mr Martin Rooney (verified owner)

    Well packaged and easy to fit

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  10. Anonymous (verified owner)


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  11. Mark Wynter (verified owner)

    No problem

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  12. Neil P. (verified owner)

    Good price and long date

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  13. Derek S. (verified owner)

    Good price

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  14. ron Houston (verified owner)

    As above

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  15. Keith M. (verified owner)

    Perfect replacement

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  16. Peter (verified owner)

    Good value and long expiry.

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  17. Duncan Bruce Davidson (verified owner)

    long life items, easy to fit

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  18. Neil D. (verified owner)

    Auto capsules and salt bobbins readily available for maintenance on United Moulders MK5 and Halkey Roberts life jackets

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  19. Ian Culley (verified owner)

    Goods as requested!

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  20. David Patuck (verified owner)

    Wide selection of capsules, including the ones I required. Reasonable “use by” date.

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  21. Marc (verified owner)

    Great product with a long expiry date.

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  22. Richard (verified owner)

    As ordered

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  23. kevin s. (verified owner)

    It’s what I needed

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  24. Anonymous (verified owner)

    All good

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  25. Mark (verified owner)

    Good quality and fast delivery, good date

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  26. Philip Law (verified owner)

    Good quality and fitted straight away

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  27. Jon Welford (verified owner)

    Bring my lifejackets up to date, easy to fit.

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  28. Sarah T. (verified owner)

    Did the job. Auto now manual.

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  29. Peter B. (verified owner)

    Hope I never use them.

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  30. Ronald Plunkett (verified owner)


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  31. Peter King (verified owner)

    Guaranteed minimum of two years before expired date but had three years

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  32. John McMeeking (verified owner)

    Good product

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  33. Michael Bradley (verified owner)


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  34. Roger Buxton (verified owner)

    Product received within 24 hours .

    (0) (0)
  35. Gael Lewis (verified owner)

    Review for LifeJacket Auto Capsules
    ★ ★ ★ ★ ★

    (0) (0)
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