PEX-B is manufactured using the silane (moisture cure) method and is the most common PEX type in residential plumbing. Advantages over copper: 60-70% lower material cost, faster installation (fewer fittings), freeze resistance (expands without bursting), no corrosion, quiet (no water hammer), flexible (fewer joints = fewer leak points). Connections: crimp rings (copper), clamp rings (stainless), expansion fittings (ProPEX/Uponor), push-fit (SharkBite). Maximum temperature: 200°F. Maximum pressure: 160 psi at 73°F. UV sensitive — cannot be exposed to sunlight (6 month max during construction). Not suitable for outdoor above-ground use. Approved under IPC and UPC. Some jurisdictions still restrict PEX — verify local code acceptance. Cannot be used within 18 inches of water heater (use copper stub-out). CSI 22 11 16.