API REPLACEMENT PLASTIC TEST TUBES WITH CAPS For Any Aquarium Test Kit Including API Freshwater Master Test Kit 24-Count Box
$23.40
Price: $23.40
(as of Oct 12, 2025 18:12:18 UTC – Details)
API TEST TUBES serve as replacement test tubes for those included in API TEST KITS. Product comes with 24 capped test tubes in API box. Test tubes may be used with all liquid API TEST KITS.
With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.
Is Discontinued By Manufacturer : No
Product Dimensions : 7.13 x 1.25 x 3.5 inches; 3.21 ounces
Item model number : 32
Department : Unisex-Adult
Date First Available : June 15, 2004
Manufacturer : Mars Fishcare
ASIN : B0002AQL5G
Best Sellers Rank: #54,421 in Pet Supplies (See Top 100 in Pet Supplies) #76 in Aquarium Test Kits
Customer Reviews: 4.6 4.6 out of 5 stars 1,304 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Contains one (1) API REPLACEMENT TEST TUBES WITH CAPS For Any Aquarium Test Kit Including API Freshwater Master Test Kit 24-Count Box
Compatible with any aquarium water test kits including freshwater and saltwater test kit, pH test kit, ammonia test kit, nitrate test kit, reef test kit, calcium test kit and more
The API test tubes are perfect to replace API Freshwater Master Test Kit tubes, API Saltwater Master Test Kit tubes, API Reef Master Test Kit tubes, API Pond Master Test Kit tubes and any other API Test Kit tubes
Snap-tight plastic caps
Use when original tubes have been lost or damaged
Customers say
Customers find these replacement test tubes to be of good quality and value, working well with API test kits and making multiple tank testing easier. The tubes arrive in perfect condition, and customers appreciate their functionality. Regarding durability, while some customers report never breaking them, others mention they break easily. The seal quality receives mixed feedback, with some saying they fit nicely while others wish the caps were tighter. Additionally, customers report leakage issues with these test tubes.
13 reviews for API REPLACEMENT PLASTIC TEST TUBES WITH CAPS For Any Aquarium Test Kit Including API Freshwater Master Test Kit 24-Count Box
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tyler smith –
Perfect Replacement Test Tubes â Great for API Test Kits!
The API Replacement Test Tubes with Caps are a fantastic solution for anyone in need of replacement tubes for their aquarium test kits. I use an API test kit to monitor the water parameters in my tank, and these replacement tubes fit perfectly. The quality is excellentâthick glass that feels durable and resists cracking or breaking during use. The included caps are a great addition, ensuring no spills or accidental contamination of test samples, which is crucial for accurate results. These tubes are easy to clean and work just as well as the original ones that came with my API test kit.What I really appreciate about these replacement test tubes is how versatile they are. They fit not only API test kits but also many other brands of aquarium test kits, making them a great universal option for anyone who needs new test tubes. For anyone using an API kit, these are an essential and affordable replacement part that keeps everything running smoothly. I highly recommend the API Replacement Test Tubes with Capsâtheyâre high-quality, reliable, and perfect for maintaining your aquarium’s water quality testing.
Kelsey Nelson –
Good Quality
Perfect plastic tubes! Just like the ones in the API master kit. Iâm able to check all of my tanks at once now!
Don Gray –
Glass tubes for API test kits…
API test kits have switched over to using plastic vials. While less breakable, the plastic ones become stained if you dont promptly clean them out thoroughly. Also the plastic 5mm lines are often difficult to see.These glass tubes are the actual API tubes with the 5 mm fill lines and very secure caps. They are far easier to clean out than the plastic ones and if capped are less likely to spill. Now sure youll occassionally drop one and break it. But with this set you’ll have plenty to replace broken ones and do as many tests as you want to compare before and after readings. I got a tube holder here on Amazon that also allows me to have several sets of the 7 tests I do displayed without risk of dropping them or knocking the off tables. Really is well worth having these if you do the API water testing much.
Emmy –
Amazingly, none were broken!
They’re exactly what I wanted (the api test kits no longer come with glass test tubes, but with little plastic tubes that are harder to read because they’re kind of foggy rather than clear and because they eventually stain). This was the most economical way to get glass tubes, and I’ll probably have enough to last me the rest of my life, even if I were to break quite a few, lol.HOWEVER, the packaging leaves a lot to be desired. The tubes are in a thin paperboard box and that is tossed into a cardboard shipping box. Nothing is wrapped or protected at all. I’m honestly quite surprised none arrived broken.
Emily Shepard –
Really good quality
The glass is really clear (not cloudy like some other brands) and it’s great that the level line is marked off (makes measuring the amount for water tests super foolproof). I also bought some cheap plastic pipettes so that I disturb the tanks as little as possible, but more so because it’s really easy to fill up these tubes to the line with the precision of a pipette. The caps fit snugly and I’m never worried about any leakage while shaking up the chemicals with the water during testing. To clean, I just run it through some warm water after I’m finished with the testing and the tubes are as good as new again. Great product and I love testing my aquarium’s water quality with this more precise method.
L.B. –
Replacement test tubes
Was in great need for replacement tubes for the kit. Great product .
Aarwen –
Extra Test Tubes are great to have
My son accidentally broke two of the glass test tubes that came with the ammonia and pH test kits. Just when I needed it most, I had nothing. The pandemic made it worse, where Petco and PetSmart were always out of stock. So, I made sure that I ordered a set of 24 in case of more accidents. The glass is not that thick but sheer so that you can make a good color reading which is important. I’m skeptical about using the plastic bottles because I’m not sure how clear they would be to make a good reading. Plus, I prefer glass for the share visibility. I wish the glass was more durable though, because the cleanup SAR another issue, tiny glass pieces can be missed and end up in your Barefoot. Ouch! Overall: good for sheer visibility color check. Value: could be cheaper as glass always needs to be replaced when broken.
Mike –
Now plastic, not glass.
Picture and description are outdated and wrong. Like several other reviews have stated, the tubes are now plastic. Deceptive picture and description of item. Paid for glass test tubes and received plastic ones.
Melody D. –
Awesome. Arrived ahead of schedule. NO breakage.I’m so happy I bought these. Much better than my plastic ones.
Jessica –
What was ordered. Replacements for broken ones from other test kits.
Wightman –
Fantastic dint not realise they was made out of glass so now i realise why they bit on expensive side but I’m absolutely pleased with the product very well made and none was broken which is a bonus definitely worth paying the price for what they are api products are the best
Terrence Tan –
Received product in good order.
Christian –
All vials arrived in perfect condition! I got these to replace the tubes I had because I broke all four of mine accidentally. The only complaint is the price I wish it was a bit cheaper.Overall this is a decent product.