Bokang Mokwena gave City the lead in the 54th minute at the Richards Bay Stadium but Knox Mutizwa levelled with 84 minutes played to take the tie to extra-time.
Substitute Mbulelo Nombengula then fired home to put the hosts ahead and Lundi Mahala added a third goal with 120 minutes on the clock to seal Richards Bay's progression to the semi-finals.
Speaking after the game, a delighted Gabriel said on IOL: "I think the writing was on the wall because today it was all us here except for the first 10 minutes of both halves in regulation time. We were good today, the display was fantastic.
"The opposition failed to keep up with the pace of the game, we played the game at a really high tempo, and the quickness of our players made it hard for the opposition."
Gabriel added: "Winning this cup would be huge for the club and everyone associated with it. We want to try and win it, we will give it our all.
“We believe that there's an opportunity to grab it, and hopefully luck runs our way, a few moments go our way, and you know how football goes; you can end up with a cup in the blink of an eye.”
Golden Arrows coach Manqoba Mngqithi cut a frustrated figure after watching his side crash out of the Carling Knockout semi-finals despite dominating large spells against Marumo Gallants at King Goodwill Zwelithini Stadium on Sunday.
Kaizer Chiefs will not participate in the Prince Mangosuthu Legacy Cup 2025 due to changes in their schedule after progressing to the CAF Confederation Cup group stages.
Orlando Pirates will enjoy home advantage when they take on Marumo Gallants in the 2025 Carling Knockout Cup final, after the Premier Soccer League (PSL) confirmed the venue and date for the much-anticipated clash.
Richards Bay mentor Ronnie Gabriel was proud of his players despite their 1-0 defeat to Orlando Pirates in the semi-finals of the Carling Knockout.
