EVERLOC compression-sleeve fittings are ideal for heating, snow and ice melting, hydronic radiator connections, when used with REHAU's RAUPEX® PEXa pipes. EVERLOC fittings and compression-sleeves create reliable connections. Adapters connect RAUPEX pipe to other piping systems. Make threaded connection before connecting to RAUPEX pipe. RAUPEX pipe installation is performed with EVERLOC tools. Follow all published installation instructions. Order EVERLOC sleeves separately. REHAU recommends that threaded adapters should be accessible for periodic inspection.EVERLOC fittings are not approved for potable water applications.