Onduparaka needed an extra effort to edge past a resilient Water in the round of 16 game played at the greenlight stadium, Arua on Sunday.
With the two sides settling for a barren score at halftime, it seemed harder for last year’s runners up to break down Water until the final quarter of the game.
The Caterpillars surged up to score goals in the closing 15 minutes of the game through Ceasar Okhuti and Rashid Agau.
Okhuti broke the deadlock in the 75th minute before second half substitute Rashid Agau who had replaced Dickens Okwi doubled the lead four minutes later to help Onduparaka advance to the quarterfinals.
In the other games played, Police football club needed penalties to defeat Buganda regional side Kyetume FC.
The game played in Nakisunga,Mukono ended 1-1 in normal time but Police won the tense penalty shootout 9-8.
The other game played on Sunday saw Sadolin Paints also advance to the last eight after a 1-0 win over Fufa Big league side Baza Holdings.
7 teams have secured slots to the quarterfinals including Paidha Black Angels, Vipers,Express, URA, Police FC, Onduparaka and Sadolin Paints.
The final slot will be taken by either Kataka FC or KCCA FC who will play at a date yet to be communicated.