An offset-alignment pivotable high-pressure coupler fitting for use to demountably and sealingly engage two misaligned high-pressure fluid lines. The coupler fitting comprises: (i) a female part having a bore therethrough with one end configured for sealing demountable engagement with an end of a first high-pressure fluid line and the other end having a symmetrical spherical recess, (ii) a male part having a bore therethrough with one end configured for sealing demountable engagement with an end of a second high-pressure fluid line and the other end having a symmetrical spherical protrusion that matches and is slidingly communicable with the spherical recess in the female part, and (iii) demountable engagement means configured for demountable and sealing engagement of the symmetrical spherical recess of the female part and the symmetrical spherical protrusion of the male part.