due to high velocity fluid flow past the primary sealing surface 46 the band of material lost expands at its lower end to encompass a significant portion of the transition surface 58 however as shown in fig5 the tapered secondary sealing surface 60 is unaffected as further shown in fig6 a contingency gasket 54 u2032 can be inserted between the wellhead 44 and the connector 52 which is longer than the original gasket 54 such that it contains tapered surfaces 56 u2032 and 66 of which surface 66 conforms to the secondary tapered sealing surface 60 in between is surface 65 which can be radial or sloped and preferably is parallel to surface 58 on the wellhead 44 or the tubular connection on which the invention is used thus the contingency gasket 54 u2032 has two sealing surfaces 56 u2032 and 66 separated longitudinally by a transition surface 65 if the surface 58 is still intact then gasket surface 65 has an opportunity to seal against it in conjunction with gasket surface 66 on surface 60 the gasket 54 u2032 can have a mirror image of surfaces 56 66 and 65 at an opposite end in the preferred embodiment to allow for a similar sealing effect to for example a connector 52 in the preferred embodiment the transition surface 58.