Dresser Style 401 compression couplings and fittings are ideal products for P.E. to P.E. and P.E. to copper connections. Simple and quick to install with ordinary pipe wrenches, they provide a totally dependable seal and restraint on both the P.E. and copper pipe ends. Style 401 couplings and fittings are designed for installation without disassembly. An added feature of the “401” coupling is its adaptability to use for “sleeving-in.” By removing the breakaway pipe stops, the coupling can be slid back over one pipe end to facilitate installation of a cut-in section. SEAL-PLUS restraining end delivers many proven features including a volume compensating spring washer that adjusts and maintains the gasket pressure, even at extremely low temperatures.