Tetra Whisper Air Pump (Non-UL) by Tetra.
Of course this is intended for use with an aquarium. Homebrewers use similar pumps to aerate wort. Aeration can help reduce lag times, encourage yeast cell reproduction and produce more vigorous fermentations.
Typically you would use both an aeration stone and an inline filter along with this.
What are others saying? Search the product’s Amazon reviews for “wort”
1/11/19 6 PM Central: This is selling for $6.71. Shipping is also free to many US addresses, with a qualifying order, as part of the Amazon’s Add On promotion. Prices, shipping and availability can change quickly. Please note that product prices and availability are subject to change. Prices and availability were accurate at the time this post was published; however, they may differ from those you see when you visit Amazon. Check the product page for current price, description and availability. Also: Recent Amazon Finds and Amazon Fillers Resource Page
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Oxygenation and Aeration Supplies at William’s Brewing