This OEM 2-pack features 9-1/4 inch ID O-rings with a 1/8 inch thickness

This genuine OEM fitting package includes the essential brass ferrule and nut

Durable Construction: Housed in a corrosion-resistant aluminum shell designed to withstand rigorous outdoor environments

Integrated Circuit Protection: The inherently limited design prevents damage from short circuits without requiring manual fuse replacement

This specific model is engineered with a 22VDC coil

System Sensor 5621 Detector This OEM 2-pack features 9-1/4The System Sensor 5621 is a commercial grade dual circuit mechanical heat detector designed for high reliability fire detection in environments where traditional smoke sensors are prone to nuisance alarms. This 135F fixed temperature and rate of rise heat detector utilizes two independent circuits to trigger both local alarm systems and auxiliary devices like fans or door closers. The Rate of Rise (ROR) element responds to temperature increases