AQUANEAT Aquarium Check Valve: One-Way Non-Return Valve for Aquarium Air Pump

Amazon Customer: Must have these if using an air pump

United States on Nov 10, 2023

AL: Appears to be a good product, It was very easy to install this safety valve

United States on Sep 16, 2023

Mr. T Charlotte-NC-USA: Ordered 3 bottles this time. Just had a 25 K /$ KOI POND FINISHED. I test the water. ALL 3 bottles test extremely alkaline. I am a Registered Nurse. I have the knowledge of test tube cleanliness, testing!
I continued to change the water Alkaline to 6.0.
Went from 1 bottle to another/all test bright blue. This KILLED MY 1st group of 7 KOI FISH. Because all 3 bottles were defective. KOI FISH COST $40.00 to $100.00. I killed them because I continued trying to change the ph based on results from (3) THREE BOTTLE RESULTS. Clear? DONT BUY THIS PRODUCT FROM AM. AM. Must have purchased these defective or as a possible low grade of bottles to sell them at a lower price!
THIS PRODUCT OR BATCH OF TESTING SOLUTIONS KILLED MY NEW KOI FISH!! I depended on each bottles results. THEY ALL TEST BRIGHT DARK LOOKING BLUE WHICH IS OFF THE CHART :!!! Based on testing results this product KILLED MY KOI FISH!! FACT!! FACT!!

United States on Aug 11, 2023

a teacher: My airpump, tubing and filter system was good to go once I added an inline air checkvalve to the system.
The checkvalve worked very well and it is necessary so that water does not get into the air pump.
I received ten checkvalves in the package as advertised.I think the quality was very good for my application.

United States on Jul 27, 2023

Gustavo Bauer: They give peace of mind to some extent. Not a big fan since they do restrict air flow. Put them on after 2 years of just pump and line. Using the tip of an incense stick opened up all 3 valves. They were tough to push in the air line.

United States on Feb 05, 2022