Need to be able to flush the boat from the drive, which has dual water pickup.
Duct taping is not an option.
Can I use the muffs and the lwp flush cone at the same time, but capping one of them? Meaning cap one of the hose inputs.
Will this create enough suction for the muffs if i cap the lwp cone?

Or would I be better using muffs and getting this flush seal kits from Teague for the lwp?
http://teaguecustommarine.com/index....-seal-kit.html

The flush kit is the way to go. Easy to use.

Thanks, but that's not an option now.
As i said, need to flush from the drive.

Yes, I use muffs and the seal kit to flush my boat. The seal kit is a Merc. part # and it just seals off the low water pickup.