The V36 dry sprinkler is used in special applications such as freezing environments and conditions where sediment or foreign materials might accumulate in ordinary horizontal pipe nipples. the model V36 dry type horizontal Sidewall sprinkler utilizes a frangible glass bulb. at the bulb�s rated temperature, the sprinkler opens releasing the bulb seat assembly, causing the inner tube assembly to move, allowing the spring assembly to pivot alongside the inner tube. at this time, water flows through the sprinkler and is distributed by the deflector, in an approved discharge pattern. the heart of the model V36 sprinkler�s proven actuating assembly is a hermetically sealed frangible glass bulb that contains a precisely measured amount of fluid. when heat is absorbed, the liquid within the bulb expands increasing the internal pressure at the prescribed temperature the internal pressure within the bulb exceeds the strength of the glass causing the glass to shatter. this results in water discharge which is distributed in an approved pattern. Easy and safe installation - open end, socket-style and recessed sprinkler wrenches are designed specifically for installing Victaulic sprinklers Light hazard Standard/Approvals: cULus Listed, FM Approved Application: For dry areas