Stringer, the day after his 36th birthday, came on to replace Martyn Roberts on the hour and saw Matt Banahan round off the rout with two more tries to complete his hat-trick. Bath now sit eight points clear of Newport Gwent Dragons at the top of Pool Two with a perfect four wins out of four.
They meet the Dragons at Rodney Parade in Round Five in the new year and a draw will be good enough to clinch a quarter-final place.
It took a mere three minutes for Bath to break down the Italians' defence when Carl Fearns crashed over for the opening try. By half-time there had been four more tries as the score mounted to 29-0.
Mogliano, who had conceded nine tries in a 55-8 defeat a week earlier on home soil, missed with a penalty in the first half, lost one player to the sin-bin and never looked like threatening the home line.
Banahan raced over for the next try a minute after the re-start and he ended the game with four tries. Fearns got a second, replacement Olly Woodburn got two and George Ford ended with 13 points.
Newcastle Falcons fell one try short of a bonus point in their Pool Three clash with Rugby Calvisano. Their 25-10 victory in Italy featured two tries from Zach Kibirige and a third from replacement Rory Clegg.
The win took them to level on 14 points at the top of the group with Brive.
In the the third game on Saturday afternoon, Bayonne thrashed Aironi 80-19 in Pool Four.
- Sports & Recreation
- Matt Banahan
- Newport Gwent Dragons
- Carl Fearns