go down to the plubing store. they make end caps for pvc pipe you can use that. just cut a hole in the middle, drill 4 holes for the bolts and you're good to go. some of the end caps are perforated so you don't have to cut a hole but it does cause a slight restriction.
but if you're really serious, just get one off of ebay. u can get one with a filter for like 15 dollars.
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