Gareth McCarthy crosses for Pontypridd against Aberavon
Neath and Pontypridd will face each other in the Konica Minolta Cup final on 17 May after the All Blacks beat Glamorgan Wanderers 49-37 at Aberavon.
The Welsh Premiership champions were too powerful for the Cardiff-based club in a free-scoring semi-final.
Skipper Lee Beech, ex-Wales fly-half Arwel Thomas, flanker James Merriman and centre Jonathan Spratt were outstanding for Rowland Phillips' side.
On Saturday Pontypridd overcame Aberavon 33-10 at the Arms Park.
Tries from Gavin Dacey, Gareth McCarthy Kristian Baller and Chris Clayton helped Pontypridd to victory.
Aberavon got a penalty try after Pontypridd collapsed a scrum.
The rest of Aberavon's points came from fly-half Ricky Thomas while McCarthy and Baller shared Pontypridd's kicks.