With injuries influencing selection coach Richard Hodges makes only one change to the side that lost to The Quins in midweek.
"We know what Bedwas will bring to the game, they work hard for each other and they will punish us if our game management is poor. They comfortably beat us earlier in the season so we must avoid a repeat of that performance" he added.
Harry Trelawny returns at scrum half in the only change to the starting line-up but there is a reshuffle on the bench with Ieuan Davies, taking a break from duty with the Wales Under 20s side, returning as replacement hooker and Gareth Morris and Tom Evans also resuming bench duties.
Glamorgan Wanderers 15. Owen Marshall 14. Steve Cullen 13. Mathew Trowbridge 12. Ross Wardle 11. Ryan Healey 10. Jason Pocock 9. Harry Trelawny; 1. Nathan Trevett 2. James Richards 3. Mark O'Leary 4. Gareth Knight 5. Alex Luff 6. Richard Thomas 7. Lee Highgate (capt) 8. Carl Kimber
Replacements:16. Ieuan Davies 17. Ryan Beddows 18. Tom Evans 19. James Hadfield 20. Robin Lock 22. Rhys Dyer 23. Gareth Morris