SPK2112 Features: * Air alarm system * Air canister * Mounting hardware * Horn * Activator: 19"" Chain * Canister contents: Tetrafluorothane * Secured to emergency equipment using mounting bracket with a worm-screw clamp * Position alarm unit so that there is minimal slack in the chain * Chain is to be connected to the activator of the equipment by means of an S-hook * When emergency equipment is activated horn sounds automatically * Disposable * Made in USA Disclaimer: * Warning: Use only genuine Speakman parts when repairing or replacing components