Coast coach and hooker Ngarimu Simpkins was naturally delighted with the win.
"To beat a team as good as Wanganui is a huge confidence boost for the boys but we'll be keeping our feet on the ground, it's still only one win in a round-robin competition," said Simpkins.
The Coast rocked Wanganui with a try from a Wanganui kickoff.
Simpkins, prop Ziggy Fisihoi, first five-eighths John Semple, No 8 Morgan Wirepa, fullback Verdon Bartlett and second five-eighths and captain Rua Tipoki all handled before Moeke dotted down in the corner. Semple converted for the perfect start.
Wanganui never recovered and trailed 18-3 at halftime.
A few 'words' from Caskey had the desired effect as Wanganui came out firing for the second spell and when right wing Simon Dibben scored a converted try in the 53rd minute it was game on.
The Coast replied through a try to right wing Whaimotu Craft-Chemis, who finished off a strong run from openside flanker Brent Ingram. Semple's sideline conversion made it 25-10. And it stayed that way until the 76th minute when Wanganui centre Saul Chase scored a consolation try for the visitors.
East Coast 25 (TK Moeke, Ziggy Fisihoi, Whaimotu Craft-Chemis tries; John Semple 2 cons, 2 pens) Wanganui 17 (Saul Chase, Simon Dibben tries; Mark Davis, 2 cons, pen). HT: 18-3.