Peter Beagrie had already gone close to opening the scoring for United, who saw his eighth minute shot come crashing back off the woodwork.
Seventeen minutes in the Monkey Hangers lost the services of veteran midfielder Tommy Widdrington, when an ankle injury forced Chris Turner to replace him with youngster Adam Boyd.
Martin Carruthers thought he'd won United a chance to equalise when he was apparently brought down by Pool defender Chris Westwood whislt preparing to shoot.
Moments later though the sides were level again when Beags put in a corner from the left which fooled the home keeper sufficiently enough to go straight into the back of the net.
Only a block from Iron 'keeper Tommy Evans prevented Widdrignton's replacement Boyd from putting th home side back into the lead after he broke free of the Iron defence.
Twenty minutes into the second half Martin Carruthers was again upended by Chris Westwood, this time the ref pointed to the spot and Peter Beagrie put the ball away to give United the lead.
An excellent shot from Gordon Watson equalised for the home side after just ten minutes though, after he cut inside before unleashing a shot which left Evans grasping at empty air.
Moments later Watson could have put his side back into the driving seat, only for Evans to save his shot.
Midfielder Paul Smith did exactly that with nine minutes to go, connecting with a Michael Barron ball with a diving header.
The final moments of the game saw United push forward, but the home defence were disciplined and were able to keep us at bay despite concerted pressure.