The Kelvin and Aimee Tyler-trained 7yr-old has to take on the might of a talented army of North Island raiders to take the 4200m feature.
To do the South proud and win the $75,000 event, Adequacy will have to record his first hurdle race victory.
Though he clearly goes into the Grand National without a sparkling record over small fences, he does have one thing on his side.
The staying test of running 4200m on what should be a holding and testing track should be something Adequacy handles better than some of his rivals, who have not raced over 4200m before.
The horse's fitness levels cannot be questioned, as Adequacy is coming off a second behind It's A Wonder in the Koral Steeplechase on Saturday.
Instead of going on the Grand National Steeplechase, the Grand National Hurdles was a better fit for the horse this year, Kelvin Tyler said.
''I just feel he is a year away from that real gruelling 5500m race.
''It is still going to be a tough race, 4200m, it is a 1000m more than the hurdlers have been going lately, so it will sort a few out.''
Adequacy met with two of the favourites for today's race when he ran fifth in the Wellington Hurdles last month.
Early favourite Bad Boy Brown and second favourite Laekeeper enjoyed contrasting fortunes in Saturday's Sydenham Hurdles.
Laekeeper and another leading chance in today's race, No Tip, both crashed out of the race on the home turn.
Bad Boy Brown went on to run a strong second after working in to the race wide on the track.
He was overhauled in the last 200m by a good finish from Guy Fox.
Bad Boy Brown's trainer, Harvey Wilson, old NZ Racing Desk the result could have been down to how each of the two horses measured the last fence on Saturday.
''I think Guy Fox caught that last fence slightly better and had the momentum on him, but he didn't give up and chased hard all the way.''
Wilson said Bad Boy Brown pulled up well after his Sydenham Hurdle run and the outing should have him primed for today's event.
''He was very bright [on Sunday] and that run will have taken the edge off him, as he pulled quite hard, so he will be ready to go.
''He went a good race with an eye to [today], where he will definitely appreciate the extra distance.''
Bad Boy Brown was rated the $3.70 favourite on market opening for the Grand National Hurdles.
Laekeeper was the second favourite at $4 and Guy Fox was rated third favourite at $4.50.
The remainder of the field is headed by the Hawke's Bay Hurdles winner No Tip, who is looking to drastically turn around his fortunes after his spill on Saturday.
