Insulated subassembly

An insulated subassembly for connecting pipes in a pipeline, comprising two insulating half shells made from an insulating plastics, a housing half shell surrounding each insulating half shell, wherein the housing half shell surrounds the outer peripheral surface of the insulating half shell, and at least one hinge connecting the housing half shells, wherein the insulated subassembly contains at least one coupling positively surrounded by the insulating half shells, integral closure elements arranged as pairs on the housing half shells, wherein one of the pair of closure elements is configured as a closure tab resiliently connected to an edge of one half shell and another of the pair of closure elements is a closure hook on a surface of the other half shell, wherein the closure tab is hooked into the closure hook for closing the insulated subassembly, the insulating half shells and the housing half shells being configured to provide a plurality of connecting pieces each receiving a pipe, wherein a receiving ring is arranged in the connecting pieces for encompassing the pipes;

• and wherein the surface of the half shell containing the closure hook is provided with a recess surrounding the closure hook, with the recess receiving the closure tab.