2 questions

[Zarkohl]

1) in a number of posts people talk about a certain motor being a "looper". What is a looper and is it good or bad?

2) I recently tried a 9.9 kicker on my v20. but when I went to the stern to start it (non-electric kicker) water came in the floor drain. I read in a post that water coming in the boat like that can be corrected w/check-valves between the floor and hull. I can't, however, seem to find a find info or pics of these "check valves". Could someone please give me some addnl info of these. Thanks, Jim