Each brass push 90 deg elbow with drain/vent allows for water to be drained from the line if needed. Common applications include draining irrigation systems or hose bibbs when winterizing. Compatible with PEX, copper, CPVC, PE-RT and SDR-9 HDPE pipe. Ideal for working in tight spaces. Faster install time and ease of use reduces installation errors.Compatible with PEX, copper, CPVC, PE-RT and SDR-9 HDPE pipes in any combinationNo special tools, crimping, soldering or glue requiredCan be installed in wet linesApproved for underground and behind-the-wall applications with no access panels (wrapping required when burying underground)Large diameter fittings (1-1/4 to 2 in) require a stiffener (sold separately) when connecting to PEX pipeRemove using a disconnect clip or disconnect tongs (both sold separately)