As stated in the title, fits Aquaclear 20, 30 and 50 filter inlet fittings May fit others but I can CONFIRM these will fit. At the moment it gets a 5 star rating. Delivered quickly, arrived without damage. Fits tightly to the end of the filter inlet pipe, don't worry about it falling off. The retaining ring in the filter itself fits perfectly into the tube. I've posted a few photos so you can judge for yourself. I use this in a frying tank I run to keep my little friends from getting sucked in. Perfectly assembled, no problems at the moment. If anything changes I'll edit this review but for now I'm happy with this purchase! Not to mention it saves me from having to buy lots of sponge filters for my Aquaclear.
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