(1st leg Caerphilly 41-28 Rugby Parma)
Caerphilly progressed through to the semi-final of the Parker Pen despite a 15-10 defeat against Rugby Parma in Italy.
The result means the Castletown Men progress through by eight points thanks to their 41-28 victory at Virginia Park last weekend.
Caerphilly started the stronger and took a 10-9 lead into the break, but three second-half yellow cards proved costly.
Taumaholo Taufahema scored the only try of the game after superb forward play had allowed Sam Cox to break through and feed the Tongan international who touched down.
Justin Thomas added the conversion and a penalty goal but the Italians responded with three penalty goals from full-back Corrado Pilat to trail by one point in the game and 14 points overall.
In a scrappy second-half Mark Ring's side lost their composure and discipline as the Italians started to come back into the game.
Early in the half Faeo Vunipoloa was sent to the sin-bin, and he was followed by Paul Jones and Nic Rouse.
But despite intense Italian pressure, Parma could only manage two second half penalties.
Caerphilly: Tries: Taufahema. Con: Thomas. Pen: Thomas.
Rugby Parma: Pen: Pilat 5
Rugby Parma: G Peens; R Marchetti, G Branchi (capt), L Larini, N di Maura; C Pilat, M Capitani; D Meggetto, S Busato, T Paoletti, A Giacon, M Bosman, M Zaffiri, A Birchall, G Hayter
Replacements: V Golfetti, F Guidetti, F Staibano, F Soncini, A Brancoli, R de Marigny, M Tamati
Caerphilly: J Murphy; R Howells, T Taufahema, S Cox, G Lewis; J Thomas, A Chilten;L Manning, F Vunipola, R Skuse/D Sweet, M Workman, P Jones, G Jones, S Grainger, A Williams.
Replacements: F McLoughlin, L Richards, G Liddon, R Skuse/D Sweet, R Bilton, N Watkins, N Rouse.
Referee: Didier Mene (France)
Rugby Parma 15 Caerphilly 10
HT: 9-10 Attendance:
Rugby Parma: Pens - G Peens 5
Caerphilly: Try - T Taufahema; Con - J Thomas; Pen - J Thomas
Caerphilly qualify for the semi-finals on + 8 points difference (51-43)