Girvan Dempsey's men have claimed 19 points out of a possible 20 so far in the British & Irish Cup and need just one more point to guarantee qualification to the quarter-finals.
In the previous round of matches Leinster 'A' recorded a convincing 31-0 bonus point win over Welsh club Cross Keys, with tries coming from Darragh Fanning (2), Bryan Byrne and Jordan Coghlan.
Moseley pushed Leinster 'A' close as a Fanning try 10 minutes from the end of the game, followed by a Cathal Marsh conversion, gave the province a 24-22 victory in Billesley Common back in October.
Entry to Friday's game costs 10 euro for adults and 5 euro for children/students. Admission for Leinster Season Ticket holders is free.
LEINSTER 'A' (v Moseley): Darren Hudson; Sam Coghlan Murray, Collie O'Shea, Jordan Coghlan, Darragh Fanning; Cathal Marsh, Luke McGrath (capt); Ed Byrne, Bryan Byrne, Tadhg Furlong, Ben Marshall, Quinn Roux, Jack Conan, Josh van der Flier, Leo Auva'a.
Replacements: Cian Culleton, Peter Dooley, Ross Molony, Gareth Austen, John Cooney, Ross Byrne, Andrew Boyle.