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General Fire Protection Special Hazards Pipe Preparation Product Spotlight Style 152A Expansion Joint Coupling Pressfit System How Pressfit Works Pressfit Productivity PermaLynx System QuickVic Installation Ready Couplings LP-46 Storage Sprinkler FireLock Series 7C7 Compressor Package FireLock EZ Rigid Couplings FireLock NXT Automatic Devices FireLock Series 747M Riser Module Virtual Demonstrations The heart of the Pressfit system's design is its precisely molded, synthetic rubber O-ring gasket.   A secure, permanent leak-free joint results when the system's O-ring is compressed against the pipe, deforming the pocket holding the O-ring and sealing the fitting to the pipe's outer diameter.      1. O-Ring Precisely molded gasket made of synthetic rubber in several application grades for a variety of wet and dry services. 2. O-Ring Pocket Sized to contain the O-ring before assembly, the pocket is deformed around the O-ring during compression to fully surround the pipe for a leak-free seal. 3. Housing Precision formed stainless steel construction incorporating the pipe stop and O-ring. Adapters are available for easy field make-up of fitting combinations to threaded components. 4. Pipe Stop An internal pipe stop locates pipe position to ensure positive joining. 5. Insertion Mark A witness mark on the pipe ensures visual verification that the full pipe has been inserted for proper installation. 6. Tool Indent The Pressfit hand tool engages the entire circumference of the bead on the fitting housing to ensure a secure attachment of pipe to fitting.