20 gal. Tank Capacity Aquarium Undergravel Filters

50 Results

Under-Gravel Aquarium Filter Lee's Original UGF 15/20 Gallon 24"x12"
Brand New
(4)
$21.95
Free shipping
15 watching
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20 Gal Undergravel Aquarium Filter 2 Plate System Aquarium Outfitters
Brand New
$20.99
or Best Offer
Free shipping
Z⁣⁣O⁣⁣⁣ ⁣4⁣1⁣ ⁣Q⁣P⁣⁣⁣⁣ ⁣B⁣⁣⁣O⁣ ⁣⁣1⁣⁣K⁣ ⁣E⁣⁣⁣
Penn-Plax Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11....
Brand New · Penn-Plax
(22)
$20.87
Trending at $21.18
Free shipping
Only 1 left!
L⁣⁣⁣⁣⁣R⁣⁣ ⁣⁣⁣7⁣B⁣⁣ ⁣E⁣8⁣⁣⁣ ⁣P⁣⁣⁣A⁣ ⁣E⁣C⁣⁣⁣
New ListingUndergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P
Brand New · Penn-Plax
$20.87
Free shipping
⁣⁣K⁣⁣⁣B⁣⁣⁣⁣ ⁣⁣⁣⁣C⁣E⁣⁣ ⁣⁣⁣⁣⁣U⁣E⁣ ⁣G⁣⁣⁣V⁣
Lee's Aquarium & Pets Premium Under Gravel Aquarium Filter
Brand New
$42.81 to $96.46
Was: $51.34was - US $51.34
Free shipping
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Lee's Original Under Gravel Aquariums Filter available in 12 different sizes
Brand New
$15.99 to $109.99
$6.99 shipping
4 watching
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Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P
Brand New · Penn-Plax
$21.02
Free shipping
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Lee's Under Gravel Filter - 15/20 gal 12" x 24" #13215
Brand New
(4)
$19.99
or Best Offer
$11.99 shipping
O⁣⁣⁣E⁣ ⁣E⁣⁣⁣A⁣ ⁣P⁣I⁣ ⁣O⁣I⁣⁣⁣ ⁣⁣O⁣⁣⁣⁣⁣⁣ ⁣⁣⁣
TOP FIN Undergravel Filter System - Spare Parts - Carbon Cartridge included
Brand New · Top Fin
$36.23
Free shipping
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Lees Original Undergravel Filter 24 Long x 12 Wide (15-20 Gallons)
Brand New
$23.95
or Best Offer
Free shipping
6⁣⁣⁣⁣⁣⁣6⁣⁣⁣⁣ ⁣⁣6⁣⁣⁣H⁣ ⁣J⁣8⁣ ⁣G⁣0⁣ ⁣7⁣⁣⁣W⁣⁣
Undergravel Aquarium Filter 20/15 Gallons 2 Filter Plate System 23”x11 1/2” New
Brand New · Penn-Plax
(22)
$15.87
$10.00 shipping
F⁣⁣⁣3⁣ ⁣4⁣3⁣⁣ ⁣⁣Q⁣5⁣ ⁣⁣C⁣2⁣⁣⁣⁣⁣⁣ ⁣⁣4⁣⁣⁣M⁣ ⁣
Aquarium Under Gravel Filter System Premium Plates Air Stones Adjustable 20 Gal
Brand New
$22.74
Free shipping
Only 2 left
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RA Premium Under Gravel Filter - 15/20 gal
Brand New
(1)
$61.86
Free shipping
S⁣H⁣E⁣p⁣ ⁣P⁣o⁣n⁣D⁣s⁣ ⁣3⁣A⁣o⁣r⁣e⁣d⁣⁣ ⁣U⁣U⁣⁣⁣⁣⁣⁣⁣⁣
Undergravel Aquarium Filter for 15-20 Gallon Tanks – Two 11.2” X 11.25” Plates
Brand New · Penn-Plax
$24.99
Free shipping
S⁣p⁣o⁣S⁣n⁣s⁣B⁣o⁣r⁣ ⁣e⁣d⁣U⁣⁣⁣V⁣⁣⁣ ⁣O⁣⁣⁣9⁣ ⁣4⁣⁣⁣0⁣
Undergravel Aquarium Filter for 15-20 High Gallon Tanks Two 11.2” X 11.25” Pla..
Brand New · Unbranded
$20.75
Free shipping
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Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”
Brand New · Penn-Plax
$24.84
Free shipping
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Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P
Brand New · Penn-Plax
$22.40
Free shipping
⁣⁣⁣⁣⁣⁣⁣3⁣⁣4⁣ ⁣⁣⁣⁣7⁣Z⁣ ⁣⁣8⁣D⁣⁣ ⁣⁣X⁣X⁣⁣⁣⁣
Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25...
Brand New · Penn-Plax
(22)
$22.49
Free shipping
Only 1 left!
N⁣E⁣ ⁣⁣⁣⁣⁣L⁣⁣⁣⁣H⁣⁣ ⁣H⁣⁣6⁣⁣ ⁣M⁣V⁣ ⁣X⁣⁣⁣⁣⁣⁣
Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks –11.2” x 11.25” Plates
Brand New · Penn-Plax
(22)
$21.81
Free shipping
Only 1 left!
3⁣M⁣⁣ ⁣0⁣⁣⁣⁣U⁣⁣ ⁣1⁣⁣O⁣⁣⁣ ⁣B⁣⁣⁣⁣L⁣ ⁣⁣⁣⁣⁣⁣
Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...
Brand New · Penn-Plax
(22)
$21.81
Free shipping
⁣Z⁣H⁣ ⁣Q⁣G⁣ ⁣⁣⁣L⁣⁣C⁣ ⁣Z⁣1⁣ ⁣Y⁣V⁣⁣ ⁣7⁣⁣⁣ ⁣⁣⁣⁣⁣
CLEAR FREE PREMIUM UG FILTER 20H/15g
Brand New · Penn-Plax
(22)
$25.97
Free shipping
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Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...
Brand New · Penn-Plax
(22)
$21.81
Free shipping
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Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...
Brand New · Penn-Plax
(22)
$21.81
Free shipping
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Undergravel Aquarium Filter for 15-20 high Gallon Tanks – Two 11.2” x 11.25” ...
Brand New · Penn-Plax
(22)
$17.49
$9.99 shipping
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Lee's Pet Products UGF Bagged Undergravel Economy Filter 15/20 gallons (12"x24")
Brand New
$13.79
$44.08 shipping
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Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25...
Brand New · Penn-Plax
(22)
$26.23
Free shipping
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Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P
Brand New · Penn-Plax
$21.99
Free shipping
R⁣⁣P⁣⁣⁣ ⁣⁣⁣F⁣2⁣ ⁣2⁣⁣⁣R⁣ ⁣I⁣J⁣ ⁣S⁣⁣R⁣ ⁣⁣⁣⁣⁣⁣
Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...
Brand New · Penn-Plax
(22)
$21.42
Free shipping
M⁣⁣Z⁣ ⁣6⁣2⁣ ⁣3⁣R⁣ ⁣T⁣I⁣⁣ ⁣⁣⁣⁣Z⁣⁣⁣⁣⁣H⁣⁣⁣ ⁣N⁣⁣
Undergravel Aquarium Filter for 15-20 High Gallon Tanks Two 11.2” X 11.25” Pla..
Brand New · Penn-Plax
(22)
$26.14
Free shipping
K⁣S⁣M⁣p⁣ ⁣o⁣n⁣s⁣o⁣r⁣e⁣Z⁣d⁣H⁣ ⁣⁣⁣⁣⁣⁣⁣L⁣⁣⁣9⁣⁣ ⁣⁣
RA Under Gravel Filter - 15/20 gal
Brand New
(4)
$44.07
Free shipping
9⁣1⁣S⁣ ⁣p⁣o⁣n⁣G⁣T⁣s⁣o⁣ ⁣2⁣N⁣r⁣e⁣ ⁣1⁣d⁣1⁣⁣⁣ ⁣⁣⁣H⁣V⁣⁣
CLEAR FREE PREMIUM UG FILTER 20H/15g
Brand New · Penn-Plax
(22)
$25.97
Free shipping
P⁣S⁣p⁣V⁣ ⁣7⁣7⁣ ⁣9⁣B⁣o⁣n⁣ ⁣s⁣o⁣U⁣r⁣H⁣e⁣ ⁣d⁣⁣L⁣7⁣⁣ ⁣⁣⁣
Undergravel Aquarium Filter for 15-20 High Gallon Tanks Two 11.2” X 11.25” Pla..
Brand New · Penn-Plax
(22)
$26.14
or Best Offer
Free shipping
I⁣I⁣S⁣p⁣ ⁣4⁣0⁣o⁣n⁣s⁣o⁣r⁣e⁣d⁣ ⁣L⁣Z⁣⁣⁣⁣ ⁣6⁣S⁣ ⁣O⁣5⁣ ⁣J⁣
Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25...
Brand New · Penn-Plax
(22)
$25.71
Free shipping
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PENN-PLAX Clear-Free Premium Under Gravel Aquarium Filter Assorted Sizes
Brand New · Penn-Plax
(22)
$17.99
or Best Offer
$6.65 shipping
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Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...
Brand New · Penn-Plax
(22)
$21.81
Free shipping
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Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25...
Brand New · Penn-Plax
(22)
$22.29
Free shipping
9⁣4⁣⁣⁣⁣ ⁣⁣0⁣⁣⁣Q⁣⁣ ⁣⁣I⁣⁣4⁣⁣⁣ ⁣⁣⁣⁣⁣⁣B⁣⁣⁣
Under-Gravel Aquarium Filter Lee's Original UGF 15 Gal/20 High 24" x 12" 13215
Brand New
(4)
$19.99
$8.35 shipping
⁣⁣⁣⁣⁣⁣⁣P⁣R⁣⁣⁣⁣ ⁣⁣R⁣⁣⁣B⁣ ⁣Y⁣P⁣⁣⁣⁣⁣⁣⁣ ⁣
Penn-Plax Undergravel Aquarium Filter for 15-20 CFU20 (15 - 20 Gallons), Blue
Brand New · Penn-Plax
(22)
$21.95
Free shipping
Y⁣⁣⁣8⁣⁣ ⁣⁣⁣⁣⁣Y⁣P⁣⁣ ⁣F⁣⁣F⁣ ⁣W⁣F⁣⁣ ⁣Y⁣⁣A⁣ ⁣⁣H⁣
Penn-Plax Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11....
Brand New · Penn-Plax
(22)
$21.63
Free shipping
S⁣1⁣I⁣p⁣ ⁣o⁣C⁣n⁣s⁣o⁣r⁣e⁣d⁣X⁣⁣ ⁣H⁣E⁣ ⁣2⁣D⁣ ⁣⁣⁣⁣0⁣⁣⁣
Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P
Brand New · Penn-Plax
$21.88
Free shipping
R⁣⁣⁣D⁣ ⁣⁣V⁣⁣⁣F⁣ ⁣⁣3⁣N⁣⁣ ⁣⁣⁣⁣1⁣⁣C⁣ ⁣⁣⁣O⁣H⁣ ⁣
Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”
Brand New · Penn-Plax
$21.99
Free shipping
⁣V⁣5⁣⁣ ⁣⁣⁣⁣⁣⁣⁣⁣M⁣⁣T⁣ ⁣D⁣W⁣ ⁣⁣8⁣⁣C⁣ ⁣F⁣⁣⁣⁣
Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”
Brand New · Penn-Plax
$21.75
Free shipping
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Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P
Brand New · Penn-Plax
$24.99
Free shipping
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Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”
Brand New · Penn-Plax
$21.99
Free shipping
⁣M⁣⁣⁣⁣Q⁣⁣⁣ ⁣⁣⁣⁣⁣I⁣K⁣⁣ ⁣⁣⁣P⁣⁣4⁣⁣⁣⁣⁣ ⁣T⁣
Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”
Brand New · Penn-Plax
$22.95
Free shipping
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Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”
Brand New · Penn-Plax
$21.88
Free shipping
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Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P
Brand New · Penn-Plax
$37.86
Free shipping
M⁣⁣⁣E⁣ ⁣⁣⁣⁣6⁣6⁣⁣ ⁣⁣6⁣A⁣ ⁣⁣R⁣B⁣ ⁣⁣⁣6⁣⁣M⁣⁣ ⁣⁣
Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”
Brand New · Penn-Plax
$21.95
Free shipping
K⁣6⁣⁣ ⁣2⁣⁣⁣⁣1⁣ ⁣⁣⁣E⁣⁣⁣⁣2⁣⁣⁣⁣⁣⁣ ⁣⁣8⁣F⁣⁣⁣
Penn Plax Undergravel Aquarium Filter 15 20 High Gallon Tanks Two 11.2 X 11.25
Brand New · Penn-Plax
$21.99
Free shipping
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Penn Plax Premium Under Gravel Filter System - for 20 Gallon Fish Tanks &...
Brand New · Penn-Plax
(22)
$22.79
$9.99 shipping
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20 gal. Tank Capacity Aquarium Undergravel Filters

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50 Results

Under-Gravel Aquarium Filter Lee's Original UGF 15/20 Gallon 24"x12"

20 Gal Undergravel Aquarium Filter 2 Plate System Aquarium Outfitters

Penn-Plax Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11....

New ListingUndergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P

Lee's Aquarium & Pets Premium Under Gravel Aquarium Filter

Lee's Original Under Gravel Aquariums Filter available in 12 different sizes

Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P

Lee's Under Gravel Filter - 15/20 gal 12" x 24" #13215

TOP FIN Undergravel Filter System - Spare Parts - Carbon Cartridge included

Lees Original Undergravel Filter 24 Long x 12 Wide (15-20 Gallons)

Undergravel Aquarium Filter 20/15 Gallons 2 Filter Plate System 23”x11 1/2” New

Aquarium Under Gravel Filter System Premium Plates Air Stones Adjustable 20 Gal

RA Premium Under Gravel Filter - 15/20 gal

Undergravel Aquarium Filter for 15-20 Gallon Tanks – Two 11.2” X 11.25” Plates

Undergravel Aquarium Filter for 15-20 High Gallon Tanks Two 11.2” X 11.25” Pla..

Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”

Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25...

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks –11.2” x 11.25” Plates

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...

CLEAR FREE PREMIUM UG FILTER 20H/15g

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...

Undergravel Aquarium Filter for 15-20 high Gallon Tanks – Two 11.2” x 11.25” ...

Lee's Pet Products UGF Bagged Undergravel Economy Filter 15/20 gallons (12"x24")

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25...

Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...

Undergravel Aquarium Filter for 15-20 High Gallon Tanks Two 11.2” X 11.25” Pla..

RA Under Gravel Filter - 15/20 gal

CLEAR FREE PREMIUM UG FILTER 20H/15g

Undergravel Aquarium Filter for 15-20 High Gallon Tanks Two 11.2” X 11.25” Pla..

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25...

PENN-PLAX Clear-Free Premium Under Gravel Aquarium Filter Assorted Sizes

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – 11.2” x 11.25” Pl...

Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11.2” x 11.25...

Under-Gravel Aquarium Filter Lee's Original UGF 15 Gal/20 High 24" x 12" 13215

Penn-Plax Undergravel Aquarium Filter for 15-20 CFU20 (15 - 20 Gallons), Blue

Penn-Plax Undergravel Aquarium Filter for 15-20 (high) Gallon Tanks – Two 11....

Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P

Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”

Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”

Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P

Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”

Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”

Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”

Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2” X 11.25” P

Penn-Plax Undergravel Aquarium Filter for 15-20 (High) Gallon Tanks – Two 11.2”

Penn Plax Undergravel Aquarium Filter 15 20 High Gallon Tanks Two 11.2 X 11.25

Penn Plax Premium Under Gravel Filter System - for 20 Gallon Fish Tanks &...

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