of forms the form selected for illustration is a sleeve form body 22 with an exterior surface 24 on which is positioned a seal seat 26 referring to fig5 body 22 is positioned so that annular seal 16 overlies body 12 of plunger 10 referring to fig6 annular seal 16 is then transferred from seal installation tool 20 to one of seal grooves 14 on body 12 of plunger 10 it will be appreciated that body 22 of seal installation tool 20 need not be in the form of a sleeve it will also be appreciated that body 22 need not overlie plunger 10 as long as annular seal 16 does it will also be appreciated that seal seat 26 can be discontinuous as annular seal 16 could be just as effectively held in an expanded condition by a plurality of fingers arranged in a ring referring to fig2 a seal expanding member 30 has been developed for use in expanding annular seal 16 seal expanding member 30 has a truncated conical body 32 it will be appreciated that body 32 need not be truncated but only the lower portion of body 32 is needed to perform the expanding operation an upper portion of body 32 does not serve a useful function if its outer diameter is smaller than the inner diameter of annular seal 16 it will be appreciated that the conical.