Available parts and media list found below diagram.

Fluval 203 Parts
The Fluval 03 Series Has Been Discontinued For More Than A Decade - Not All Parts Are Still Available.

PartsAndMedia.com Aqua-Stop Impeller Shaft Gasket & Primer Bio Safe Silicone Lubricant .5 oz / 14.7ml
Retail Price: $14.99
Our Low Price: $9.32
Availability: In Stock
OAZ30219756
Fluval 203 Replacement Motor Head / Pump Unit
Retail Price: $130.99
Our Low Price: $95.30
Availability: In Stock
A-15700
Fluval 103 203 303 403 Canister Case Clips 8 Pack
Retail Price: $25.99
Our Low Price: $18.80
Availability: In Stock
A-15590
Fluval 103 and 203 Replacement Impeller Well Gasket - REPLACE ANNUALLY To Prevent Failure
Retail Price: $29.99
Our Low Price: $19.81
Availability: In Stock
A-15630
Fluval 103 203 and 303 Hose Lock Nut 2 Pack 12mm
Retail Price: $17.99
Our Low Price: $13.89
Availability: In Stock
A-15500
Fluval 103 203 and 303 Rigid Hose Elbow 2 Pack 12mm
Retail Price: $23.99
Our Low Price: $17.96
Availability: In Stock
A-15510
Fluval 403 303 203 and 103 Suction Cup 4 Pack for 12 and 14 mm Hosing
Retail Price: $21.99
Our Low Price: $14.92
Availability: In Stock
A-15520
Fluval 103 203 303 and 403 Rigid Stem Step Up Adapter
Retail Price: $16.99
Our Low Price: $13.49
Availability: In Stock
A-15528
Fluval 103 203 303 and 403 Rubber S Elbow For Intake Stem
Retail Price: $19.99
Our Low Price: $13.87
Availability: In Stock
A-15529
Fluval 103 and 203 Curved 12mm Intake Stem
Retail Price: $19.99
Our Low Price: $14.39
Availability: In Stock
A-15530
Fluval 103 and 203 Transparent Grey 12 mm Filter Hose 1 Meter
Retail Price: $24.99
Our Low Price: $17.87
Availability: In Stock
A-15570
Fluval 103 203 and 303 Exhaust / Output Stem Plug 2 Pack
Retail Price: $16.99
Our Low Price: $12.38
Availability: In Stock
A-15560
Fluval Marina 22 Inch Flexible Coil Brush For Intake Hose
Retail Price: $23.99
Our Low Price: $18.57
Availability: In Stock
10682
Fluval Clearmax - Formerly PHOS-X - 3 Pack of 100 Gram Bags For Mid To Upper Level Baskets
Retail Price: $17.59
Our Low Price: $14.12
Availability: In Stock
A-1348
Fluval Loose Granular Peat Media 500 Grams 17.6 Ounces For Mid To Upper Level Baskets
Retail Price: $24.99
Our Low Price: $17.36
Availability: In Stock
A-1465
Fluval Premium Select Ammonia Remover 1600 Gram - 56 Ounce Jar
Retail Price: $36.99
Our Low Price: $27.95
Availability: In Stock
A-1486
Fluval Premium Select Ammonia Remover 2800 Gram - 98 Ounce Jar
Retail Price: $46.99
Our Low Price: $36.26
Availability: Out of Stock
A-1487
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Fluval Universal Nylon Filter Media Bag Two Pack For Loose Filter Media
Retail Price: $17.99
Our Low Price: $12.41
Availability: In Stock
A-1428
Fluval Ammonia Remover 3 Pack of 180 Gram Bags - 540g -19oz
Retail Price: $13.99
Our Low Price: $9.92
Availability: In Stock
A-1480
Fluval Biomax Biological Filtration Media Bio Rings 500 g 17.63 oz For Middle Basket(s)
Retail Price: $19.99
Our Low Price: $14.84
Availability: In Stock
A-1456
Fluval Research Grade Carbon 3 Pack of 100 Gram (3.5 Ounce) Bags
Retail Price: $13.99
Our Low Price: $9.67
Availability: In Stock
A-1440
Fluval Sea TOTAL CLEAR Media 6.1 oz Jar Treats Up To 50 US Gallons
Retail Price: $35.99
Our Low Price: $23.84
Availability: In Stock
A-1506
Fluval Pre-Filter Media 750 Gram 26.45 Ounce Solid Waste Capturing Media For Bottom Baskets
Retail Price: $18.99
Our Low Price: $14.37
Availability: In Stock
A-1470
Fluval Zeo Carb Ammonia Remover And Carbon Combined 150 Gram 3-Pack
Retail Price: $14.99
Our Low Price: $9.47
Availability: In Stock
A-1490
Fluval Sea Phos Clear Phosphate Remover 5.3 oz Jar Treats Up to 150 US Gallons
Retail Price: $37.99
Our Low Price: $26.37
Availability: In Stock
A-1501