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+1 QUOTE=Amphiprion;2064760]A good check valve would work well for you. Be sure they utilize a plastic flap, which is less prone to sticking compared to spring-loaded models, which eventually rust.

I bought 2 diamond drill bits like the one you linked through ebay. They work fine, just remember to use the drills high speed setting. Also, through some research I came across a good idea to build a small dam around the are you want to drill, using plumbers putty. Then fill that area with...

File a complaint through ebay. They have a link to report misrepresented items. If you dont get any resolution (which may be possible given your situation) Paypal can reverse payment. Hopefully you used paypal. Good luck....I've had good and bad experiences purchasing through ebay. Mostly...