I'd stick with using a bulkhead.

making a stockman pipe right now...let you know how it turns out..

Just hate that I had to buy a full 10ft stick of 1.5" PVC just to use 20" or less

1.5" is pretty big, what size coupling are you using?

2"

That will give you less than a 1/4" clearance so it'll be tight but I guess you're not pushing much flow anyway. You might not be able to get it super quiet with the over sized pipe but let us know how it turns out.

looking around a lot of people say that if you have 1.5" pipe and use a 2" coupling it works great so, figure why not try

If you look up 'hofer gurglebuster' you'll come across another method of quieting your drain. I believe it's actually a variation of the Stockman. I don't have personal experience with either of these and did read that it may be more prone to clogging, but you may want to investigate nevertheless. Here's a link to get you started.

http://home.everestkc.net/jrobertson...struction.html

The HGB isn't ideal for most applications. Good for external overflows with height limitations but the stockman is easier and more reliable. The HGB is just a reverse stockman, you have to tune it by sliding the coupling and bushing assembly up to partially cover the side holes to closely match the flow rate and then for further tuning you need to insert a 1/4" tube into the pipe from the cap to exhaust the air from a precise location. More trouble than they are worth and from all the ones I've seen people use they end up reversing the coupling creating a plain old stockman.

i just built a very crude model, threw it together and...it sounds so much softer now. I followed this diagram
http://i265.photobucket.com/albums/i...9/stockman.jpg

did the same idea but I drilled 4 holes with a 13/32 bit, and 8 holes with a 5/32 bit, and in the top cap I drilled a 1/8 hole works good and the pump and drain seem to be working well together I will be watching both closely for the next hour or so and see if the pump is going faster than the drain but right now seems good.