Re: Hose nipple/connector on firewall?
Yep, it's a drain for the heater core. My heater core in my old Ranger cracked and the floorboard didn't even get wet. It just drained out of that. I got lucky.
GB 
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2001 Edge Regular cab, auto 4.0L 4x4 4.10LS 8.8
1987 standard cab w/92 5.0/T5Z 31 spline 8.8 w/Torsen
1989 Regular cab longbed, manual 2.9 4x4 - Parts BroncoII's x 3
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