A looper is a type of engine where the pistons and ports are arrainged in a certain way so as to better scavange the exhaust gases from the combustion chamber. THEFERMANATOR or Spareparts can probably explain it much better than I can
As to the floor drains, if you do a search in these forums you'll find many topics on that subject. Just search under drains, scuppers, and floor drains. 
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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.
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