Possibly Potamogeton tricarinatus - see ref below - but was photographed at Hidden Secret Rockhole in the Doctor Hicks Rng GVD, which is a long long way outside the known range.
ABCO Caravan Services
Lovells Springs P/L
Bushtracker
Atlas Travel Centre
DIESELHEAT
Absolute Trailer Solutions
COOKTOWN HOLIDAY PARK
SIMPLICITY AXLES
ARB CAPALABA
Hitch-Ezy Inventor
Bushtracker Owners Group Inc.
BTA Towing Equipment
Edwards Tavern WODONGA Vic
Email