Abstract: A lip seal assembly establishing a sealed relationship between two spaced relatively movable members wherein one of the members has a pair of adjacent annular recesses of different effective diameters. An annular lip seal element of resilient material is disposed in one of the annular recesses, the element having an annular lip portion extending across the space between members into engagement with the other member and establishing a seal therewith due to deformation of the lip portion. An O-ring of resilient material is disposed in the other annular recess, the O-ring exerting bias pressure on the lip seal element to hold the element in sealed relation with the associated member and to maintain the annular lip portion in sealing engagement with the other member.