Sorry if something like has already been discussed.
This will help stop water from dripping onto your MB's.
I finally found another set of replacement RMBs
Buy List, everything available at either home depot or Lowes:
Thin aluminum sheet - $12
Gasket chalk - $8
Leftover sound dampening material - $5
Tools needed: Metal snips, gloves (recommended), and zinc coated screws
This is my 1st gen. 5~6 year old Kicker RMB8 (one was blown)
Measure and cut the aluminum to the depth of the speaker + ~1" and about 1/2 the radius of the speaker
Measure up 1" and about 3/4" even slits
Bend to 90 degrees