The cap is a protector. If the transom glass should develop a crack from the bouncing and flexing it gets the cap still keeps the water out, and it serves as a protector to a limited degree for things being dropped on the top of the transom.. Plus a clean topcap looks nice also... Since things cost money, and lots of things cost lots of money, I've found that if a manufacturer spends money to install something there's usually a reason for it.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
Last edited by Destroyer; 06-30-2010 at 10:54 AM.
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