Removing oil cooler lines from cooler
 

I need to replace my oil/ps cooler. My boat is stored away from my home and don't feel like lugging all my tools, only the ones I need. Does anyone know what size wrench I need to remove oil lines from the cooler nipples.

Its Merc 454 with stock merc oil/ps cooler. Thanks

2 Adjustable wrench's. Preferably one thin one. 1 flat head screwdriver

thanks...problem is with an adj wrench, working down in the bilge you can't see if the wrench is on there perfect then you torque it, slips off, now you've stripped the thread, now I'm really screwed. Was hoping someone would know the right size offhand. If not I guess I'll just take a bunch of large wrenches and see if one fits.