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Cluster Fly Prevent Dispenser

The Cluster fly Prevent Auto Dispenser is an excellent solution to cluster flies in the loft. It contains a natural pyrethrum based insecticide which it releases on a timed basis.

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From £36.24



  • Popular Cluster Fly Solution
  • Lasts for Months
  • Includes Insecticide Aerosol
  • Now also comes with batteries
  • Contains pyrethrins

Ideal for placing in a loft or attic area where cluster flies congregate.  It can be used in any room that suffers from nuisance flies.
The dispenser can be set to spray at 7.5, 15 and 30 minute intervals. If left in operation for 24 hours, seven days a week, the approximate life of the aerosol will vary thus: 7.5 mins – 15 days; 15 mins – 30 days; 30 mins – 60 days. Each 250ml aerosol of Prevent Auto contains 3000 metered sprays.

Please note: price is for Prevent auto LED dispenser, Prevent insecticide aerosol and batteries . Replacement aerosols can be purchased separately.

How to use

  • The Prevent auto dispenser comes ready to use fitted with batteries and a can of Prevent Auto Cluster Fly Aerosol.
  • The dispenser can be set to spray at 7.5, 15 and 30 minute intervals. Initially set at 15 minute this will give approximately 30 days of aerosol life.
  • Most people place the dispenser in the attic or loft space as this is the area most commonly affected by cluster flies, but you can place it in any room in the house.
  • Stand the unit in the area affected and pointing towards any concentration of flies, it doesn’t need to be close.
  • Turn the unit on by the switch on the side and the dispenser will release a puff of pyrethrum into the air eliminating cluster flies as they become active or enter the space.
  • The time-release spray is particularly useful as hand held sprays can be ineffective against cluster flies when they are in hiding.
  • Use March-June and August-December for maximum effect.
  • Whilst the Prevent Aerosol is particularly effective against cluster flies, it can also be used against many other crawling and flying insects.
  • As it contains natural pyrethrum it is safe to use indoors including in food storage areas.

Safety data

Contains 1.0% w/w pyrethrins synergised by piperonyl butoxide. Made from natural ingredients.

Click here for Safety Data Sheet





UK Mainland

DPD Next Working Day

£6.00 (FREE on orders over £75.00)

Scottish Highlands

DPD 2 Day Service


Scottish Islands, Isle of Man, Scilly and Channel

DPD 2 Day Service


Isle of Wight

DPD 2 Day Service


Northern Ireland and Eire

DPD 2 Day Service


Please Note:

Orders placed Monday to Thursday before 3.45pm, or Friday before 1.45pm will be despatched that day.

Orders placed on a Friday after 2pm or over the weekend will be dispatched the following Monday, unless that Monday is a bank holiday.

We do not offer Saturday delivery.  Collection is possible by arrangement.

We also deliver internationally. Please contact us for a delivery quotation price before ordering. View our full delivery policy here


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