SharkBite U3008LF Slip Coupling 1/2 in . The Slip Coupling simplifies repair by doing the job that two couplings and extra pipe used to do. Only one end of the coupling has a stop, allowing the other end to slide freely over the end of a pipe. The fitting can be released with a disconnect tool and slid back onto the other end of the pipe for successful leak repair. Designed for use on CTS copper. Design certified and listed to ASSE 1061/NSF 61. Listed by IAPMO. Certified for potable and hydronic heating water distribution. Certified for underground applications. Certified as a manufactured joint without access panels. Meet UPC, IPC and cUPC requirements. Product is lead free.