Hii Keensailor

I googled the specs on yours http://batind.com.au/Products/4%20Industrial%20Hose/Petroleum.html and the specs on wet exhaust hose www.brierleyhose.com.au/rubberHose.php#makomarineexhaust and one of the obvious differences is the maximum temp for yours is a fair bit less than the wet exhaust hose and if it was me i would get the correct stuff because if it fails you have both exhaust fumes and exhaust water getting pumped into the boat

I guess if you wanted to know for sure you could contact the manufacturer and see if they think it is suitable

Regards Don