Most likely the ice box drain. You have signs of wet core around the sump. Read these threads:
Vermiculite Replacement?
Second bilge hose?
Dewatering Aft Bilge - Need Advice
Water in Bilge

ps - what hull number? This is aggravated in freezing climates.

Last edited by Rhapsody #348; 05/25/20 07:54 AM.