An Rinn eased to an 0-11 to 0-3 lead at half-time after a slick looking Gaeltacht side had racked up eight points without response by the 20th minute.
Ian Cantwell finally took the bare look off the scoreboard for De La Salle after a charge down the centre on 21 minutes. Six different players recorded scores for a rampant An Rinn during the first period.
Their only concern came when Liam Ó Lonáin departed through injury. Se La Salle nibbled away at the lead slightly with a pair of Mitchell Casey frees.
The Eastern side were dealt another a blow immediately after the restart when Kevin Moran received a black card. They only managed two points from play over the 60.
Donie Breathnach added four more points for the winners in a dull second period.
Scorers for An Rinn: D Breathnach 0-9 (5fs); F Ó Cuirrín 0-3; S Ó Cuirrín, N Ó Murchu, F Ó hAodha, L Ó Lonáin, B Breathnach, L Ó Corraoin 0-1 each.
Scorers for De La Salle: M Casey 0-4 (4fs); I Cantwell 0-2.
An Rinn: T Ó Cadhla; C Ó Murchu, R Ó Ceallaigh, S Ó Cuirrín; J De Barún, T Ó hUallacháin, N Ó Murchu; F Ó hAodha, C Ó Cuirrín: L Ó Corraoin, F Ó Ceallaigh, B Breathnach; F Ó Cuirrín, D Breathnach, L Ó Lonáin.
Subs: P Ó Murchu for Ó Lonáin (23); C Ó Conchubhair for B Breathnach (41); C Breathnach for R Ó Ceallaigh (57); E Breathnach for S Ó Cuirrín (57); D Ó hArtaigh for C Ó Cuirrín (57).
De La Salle: D Dennison; C Sheehan, C Clancy, M Sheehan; O Keevers, T Kearney, S Dalton; D Greene, I Cantwell; C Morris, L Hayes, K Moran; D Kennedy, M Casey, P Kennedy.
Subs: P Nevin for Moran (33); J Grogan for P Kennedy (43); D Breen for Greene (53); P Flynn for D Kennedy (56).
Referee: T Organ.