2023 OWNER’S MANUAL 
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 224
BILGE SYSTEM, CENTER DRAIN, 
TRANSOM DRAIN PLUGS, SEA 
STRAINERS AND SCUPPERS
 
 
Bilge pumps will not operate in either the manual or automatic 
mode if the batteries are fully discharged. This condition may 
allow excessive water into the hull, which can damage or sink the 
boat. Make frequent checks of battery charge and bilge pump 
function when boats are moored and exposed to the elements. 
Models
All
Purpose
Water inevitably intrudes into any boat. MasterCraft boats are 
designed to expel the water via the bilge system. When on the 
water, bilge pumps will expel water. Bilge pump sensors allow the 
system to pump water overboard either automatically or manually. 
Because the bilge is located in the lowest portion of the boat’s 
hull, it is not always readily apparent to individuals on-board 
whether there is water in the bilge or not. To allow operators the 
opportunity to manually verify water levels in the bilge, a center 
access plate or access door is built into every boat.
All boats (except ProStar) have two drain plugs, which allow water 
to be drained from the boat when the boat is OUT of the water. 
There is a center T-handle drain (the only one for a Prostar) and 
a transom drain plug. When out of the water, on a trailer or lift, 
water can normally be drained into the bilge system by opening the 
center drain.
Boats have sea strainers installed to assist in keeping debris 
out of the engine and water intake systems such as the ballast 
system.
Location
The bilge lines and pumps are beneath the decks. The center drain 
location will vary slightly by model, but generally is found close to 
or adjacent to the driver’s seat. It will be accessed through a hatch 
or access plate, which may be under marine carpet. A transom