Ballynahinch hosted 1B side Colin Valley at The Millbridge.
It was the home team who took the lead early on when Aaron Cheevers provided for his brother Scott.
United had more chances to increase their lead with opportunities for Scott, Jack Patterson and Aaron Cheevers, with Aaron crashing a free kick off the crossbar.
Richard Annett was commanding at the back while 4th choice goalkeeper, 41 year old, Anthony Greene saved well on multiple occasions.
Having failed to capitalise on a good first half performance, Colin Valley scored an equaliser on the brink of half-time despite strong claims of offside.
United never got started in the second half and fell behind early on.
Their misery was compounded when Matthew Hall was dismissed for a second booking.
A lacklustre second half performance allowed the away side to add four more goals to the scoreline including what looked to be another clear offside.
Player of the Match: Richard Annett
Line up: Anthony Greene, Chris Coleman, Scott Brashaw, Richard Annett, Matthew Hall, Gavin Crawford, Thomas Rodgers (Alan Dickson), Greg Hall [C], Aaron Cheevers, Jack Patterson (Luke Curry), Scott Cheevers (Jamie McNeill)