A coupling for interconnecting sections of pipe. The coupling includes a first pipe element having a first coupling member in the form of a female socket, and a second pipe element having a second coupling member in the form of a male plug. The socket of the first pipe element is dimensioned to receive therein the plug of the second pipe element. The coupling also includes a seal interface to prevent passage of air or fluids through an annular gap between the socket of the first coupling member and the plug of the second coupling member. The seal interface includes a sealing element and a sealing element retainer. The sealing element retainer is positioned internally of the coupling, within a cylindrical cavity of the socket.