Prosser has played for Wales U-20s in the Six Nations
Cornish Pirates have signed Welsh hooker Ryan Prosser from Championship rivals Bristol until the end of the current season.
The 21-year-old was a member of the Bristol Academy and has also played for Wales Under-20 side.
Chief executive Rod Coward said: "Ryan is well recommended and comes with a determination to succeed.
"If he proves his ability then we would be looking to renew his contract beyond this season."
Prosser was offered a deal with the Bristol senior side last year, but a severe knee injury kept him on the sidelines for the whole season.
The Welsh-born hooker is now back fully fit and has recently played for Newbury in National League One.