Plastic Reed switch, Flush (recessed) mount, (9.53mm) diameter x (31.75mm) length,(19.05mm) gap.

https://otwtech.com.au/shop/hc-35-plastic-reed-switch-flush-recessed-mount-9-53mm-diameter-x-31-75mm-length-19-05mm-gap-3831 https://otwtech.com.au/web/image/product.template/3831/image_1920?unique=73fd315

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