Divall and United's second half performance was one of the best they have produced since the turn of the year and it came at exactly the right time as the SCFL Division Two season edges towards its completion.
On an afternoon that saw persistent rain falling at The Oval, United were without Adam Sargent, Adam Davidson and Pete Featherstone, with Lee Daubeney, Grant Harrison and Rory Newby coming into the side.
There was also a recall for Pete Cooper in place of the ill Gianluca Del-Gaudio.
League leaders Littlehampton knew that a point was all that they required to secure promotion to Division One and found themselves ahead after fifteen minutes when a corner could only be cleared as far as Ross Mckay who fired a thumping volley past a helpless Daubeney.
Littlehampton came close to doubling their lead as Ben Gray hit a wickedly inswinging corner that was cleared off the goaline by the commanding Newby.
Liam Baitup was foiled in his attempts to bring United level by visiting 'keeper Jon Hendrick, as was Divall after cutting in from the left wing.
Littlehampton saw chances from Gray and George Gaskin, last season’s top scorer in Division Two, gratefully saved by Daubeney whose handling was impressive throughout despite the conditions.
Despite going into the break a goal down to a side that had only conceded 17 league goals before the fixture, there was a sense of optimism as the second half began and the fans who braved the weather were rewarded two minutes after the resumption of play.
A quick free kick from the by-line by captain Danny Simmonds caught the visiting defence off-guard, but Baitup was alert to steer the ball past Hendrick and give United a deserved equaliser.
Simmonds came close to adding a second shortly after when he arrived at the back post with a side foot volley that was matched by Hendrick who saved well.
United got the goal that their second half display merited on 69 minutes Cooper broke into the channel and produced an inch perfect cross that was met by a pounding header by Divall.
The game was secured with eight minutes remaining as Jamie Bunn surged forward from central midfield as he teed-up Divall to curl the ball past Hendrick for his 14th league goal of the season since joining United in October.
The result keeps United third in Division Two on 61 points with three league matches remaining, two of which are at The Oval.
United: Daubeney; Simmonds ©, Harrison (Miszkiewcz), Sherriff, Newby, Stracey, Mclean, Bunn, Cooper, Baitup, Divall