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The mylar cone and plastic centre dome combined with a card gasket around the cone, make the units fully weather and splashproof from the front. They are therefore ideal for use as sounders in portable equipment and in external burglar alarm boxes. The round type are 18mm deep.
Price: £3.49 from Tesco
| Retailer | Price | |
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| Tesco | £3.49 | Go to shop |
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