It was the visitors who opened the scoring, from a lose ball Llantwit Major seized the opportunity and crossed the try line.
Treharris replied with a fine backs move to see Corey Lloyd crash over the try line and Ross Jones converting to level the score 7-7.
Treharris doubled their score with a Steve Parry try and Ross Jones converted.
Llantwit Major kept in touch with a penalty before half time 14-10
Treharris started the second half strongly and the pressure paid off with Corey McCabe finding Adam Morgan to cross the try line which Ross Jones converted 21-10
Llantwit Major continued to fight and kept in touch with a converted penalty 21-13
A great blind side break saw scrum half Steve Parry link with Ross Jones to score 26-13.
Llantwit Major were determined to take the game all the way and once again narrowed the margin with a converted try 26-20.
It was a very tense last 10 minutes with the home side dominating the set piece. The visitors conceded a penalty and with the last kick of the game to seal the win Ross Jones converted 29-20.
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