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Penn Plax Premium Under Gravel Filter System - for 40-55 Gallon Fish Tanks &

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US $36.99

ApproximatelyC $50.77

Condition:

New

Quantity:

3 available19 sold

People want this. 17 people are watching this.

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Free Expedited Shipping.

Located in: Denver, Colorado, United States

Delivery:

Estimated between Fri, Jul 18 and Tue, Jul 22 to 94104

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30 days return. Buyer pays for return shipping. If you use an eBay shipping label, it will be deducted from your refund amount.

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eBay item number:293886993791

Last updated on Jun 17, 2025 23:54:59 EDTView all revisionsView all revisions

Item specifics

Condition: New: A brand-new, unused, unopened, undamaged item (including handmade items). See the seller's ...

Color: Blue

Size: 40/55

Shipping: Free Express United States Shipping

UPC: 786714607581

About this product

Product Identifiers

Brand

Penn-Plax

MPN

CFU55

GTIN

0786714607581

UPC

0786714607581

eBay Product ID (ePID)

17032424835

Product Key Features

Tank Capacity

55 gal.

Water Type

All Water Types

Type

Undergravel Filter

Filter Location

Internal

Item description from the seller

About this seller

Joined Aug 2010

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Detailed seller ratings

Average for the last 12 months

Accurate description

4.9

Reasonable shipping cost

5.0

Shipping speed

5.0

Communication

4.9

Seller feedback (10,517)

This item (5)

All items (10,517)

3***d (59)- Feedback left by buyer.
Past year
Verified purchase
Showed up super fast and now I have a extra one!
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Past month
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Thank you
h***g (692)- Feedback left by buyer.
More than a year ago
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Amazing seller! This is my second order and the shipping is so quick. Highly recommend this seller.

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Product ratings and reviews

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4.7

109 product ratings

92 users rated this 5 out of 5 stars
12 users rated this 4 out of 5 stars
2 users rated this 3 out of 5 stars
0 users rated this 2 out of 5 stars
3 users rated this 1 out of 5 stars

Would recommend

Good value

Good quality

Most relevant reviews

See all 71 reviews

by cheali1958
Mar 06, 2018Top favourable review
Economical, easy set-up, little maintenance used with power heads fit into risers.
I have used these for over 45 years, and have no problems once my tanks are set up. The eco system created with these is the healthiest you can have. I have had tanks set up for over 10 years and not torn completely down. If you do not have power heads, you can use the air lines and air stones inside the risers and they work just as well, but you have to have an air pump, that sometimes can get noisy. These are great as they snap together and stay in place. Using the two to two and a half inches of gravel is essential. I do not know of anything negative about the system. I would recommend it to everyone, especially if just starting out with an aquarium. Most people will start a tank up then change out water too often, not letting the eco system get built up. This is why many have ... I have used these for over 45 years, and have no problems once my tanks are set up. The eco system created with these is the healthiest you can have. I have had tanks set up for over 10 years and not torn completely down. If you do not have power heads, you can use the air lines and air stones inside the risers and they work just as well, but you have to have an air pump, that sometimes can get noisy. These are great as they snap together and stay in place. Using the two to two and a half inches of gravel is essential. I do not know of anything negative about the system. I would recommend it to everyone, especially if just starting out with an aquarium. Most people will start a tank up then change out water too often, not letting the eco system get built up. This is why many have trouble keeping the water clear and lose a lot of their fish.
Verified purchase: YesCondition: NewSold by: thehoneyroastedpeanut
by 1srvgzus2
Feb 10, 2017
Old School Aquariums.
I have been doing aquariums for a hobby for 40 years. Not as many people use a U/G filter. I do. Instead of vacuuming the substrate and doing a partial water change I just siphon from the U/G tube and replace the water. Plen-Plax is a superior product and I have used them for years. I like the over and under plates best. This filter is strong and holds up for years. I guess I am Old School cause I still believe these products work. They make your water changes simple....and no disturbing the gravel!!! Great Product!!!I have been doing aquariums for a hobby for 40 years. Not as many people use a U/G filter. I do. Instead of vacuuming the substrate and doing a partial water change I just siphon from the U/G tube and replace the water. Plen-Plax is a superior product and I have used them for years. I like the over and under plates best. This filter is strong and holds up for years. I guess I am Old School cause I still believe these products work. They make your water changes simple....and no disturbing the gravel!!! Great Product!!!
Verified purchase: YesCondition: NewSold by: living_goods
by njnvcoca
Aug 04, 2020
Terrific Quality and Price-Fast Delivery Too!
Very nice quality for a sub-gravel filter. Better than most you can get in stores. I augment all of my tanks using canisters with these as it seems to control the nitrates better with both running. Also excellent for clearing particulates, making the water very clear. I find plants grow even faster when in use, contrary to what I was concerned over. This one too is easy to adjust size for large tans or odd shapes. Great product!Very nice quality for a sub-gravel filter. Better than most you can get in stores. I augment all of my tanks using canisters with these as it seems to control the nitrates better with both running. Also excellent for clearing particulates, making the water very clear. I find plants grow even faster when in use, contrary to what I was concerned over. This one too is easy to adjust size for large tans or odd shapes. Great product!
Verified purchase: YesCondition: NewSold by: huyn-79
by dinkbuster1
Nov 08, 2017
Awesome!
For the price you cant beat this product! I always thought you needed a powerhead for an undergravel system, my air pump works just fine. If you want to see how this works look it up on youtube. Be careful though when breaking the tabs off of the blue plate the plate is made of thin plastic. The flow will be much faster if you dont use the charcoal filters, they dont do much anyways.. Very happy with this product!For the price you cant beat this product! I always thought you needed a powerhead for an undergravel system, my air pump works just fine. If you want to see how this works look it up on youtube. Be careful though when breaking the tabs off of the blue plate the plate is made of thin plastic. The flow will be much faster if you dont use the charcoal filters, they dont do much anyways.. Very happy with this product!
Verified purchase: YesCondition: NewSold by: shopsy
by newunborn
Apr 18, 2019
Better than I thought
The item came as it's descrive on the site and it come with all the plumbing needed I also realized that two of the tray filters of the 55 gal will also fit a 20 gallon long tank there is a 6 1/2 inch gap and the tubes are a bit long but they could be shotern out but overall I'm happy with the product I'll be using this set for my 40 gal the pictures are from a 20 gallon tank
Verified purchase: YesCondition: NewSold by: huntingly

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Penn Plax Premium Under Gravel Filter System - for 40-55 Gallon Fish Tanks &

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Item specifics

About this product

Product Identifiers

Product Key Features

Item description from the seller

ArmorNumber

98.6% positive feedback•37K items sold

Detailed seller ratings

Seller feedback (10,517)

Product ratings and reviews

Most relevant reviews

Economical, easy set-up, little maintenance used with power heads fit into risers.

Old School Aquariums.

Terrific Quality and Price-Fast Delivery Too!

Awesome!

Better than I thought

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ArmorNumber

98.6% positive feedback•37K items sold

Detailed seller ratings

Seller feedback (10,517)