What size hole and how deep are you going? I use a nail right in the middle of the bottom and get over a quart out of the filter.Punching a hole won't help much; it will drain some of what's in the filter, but when you unscrew it, a whole bunch more will come out still from the engine side (tried this on mine). Next time I'll be catching the filter with a 1 gallon milk jug I cut the top off of. I agree the Stahlbus is the way to go for the drain valve.
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