Drain that Waterlift Muffler!

Question: I’m finally in the process of winterizing my boat and I just noticed something that is a little troubling to me. My Yanmar diesel is equipped with a waterlift type muffler in the exhaust system but it has no drain in the base of it. I’ve been told by ABYC Certified techs that a drain is required under the ABYC Standards, but my boat doesn’t have one. Do I need to worry about this? Answer: The ABYC Standard that addresses exhaust systems does require a drain for this type of ...