Innovative push-to-connect design makes for quick and easy installation when joining same-size pipe. Ideal for working in tight spaces. Faster install time and ease of use reduces installation errors. Approved for underground and behind-the-wall applications with no access panels (wrapping required when burying underground). Large diameter fittings (1-1/4 in. - 2 in.) require a Stiffener (sold separately) when connecting to PEX pipe.