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Water Filter Adapters & Couplers

Sometimes the smallest items can have the largest impact on the quality of your water.  At Discount Filter Store, you’ll find all the small water filter adapters and couplers you need, from diverter valves, automatic shut off valves, to refrigerator water filter caps, flow restrictors, and more; everything you need to keep your water filters operating at maximum efficiency. 

Searching for more water filter parts & accessories, check out our huge selection of mounting brackets, pumps & motors, drinking water test kits, and more.

Items 1 to 25 of 27 total

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  1. 2186494B Whirlpool Refrigerator Water Filter Cap - Black

    2186494B Whirlpool Refrigerator Water Filter Cap - Black

    Built to fit into Whirlpool, KitchenAid, Maytag and Kenmore side-by-side refrigerator models that use a quarter-turn water filter in the bottom grille Learn More
    $13.99 Retail Price:  $17.24
  2. CNTP-DV-14C Tier1 Diverter Valve

    CNTP-DV-14C Tier1 Diverter Valve

    Fits various countertop reverse osmosis systems Learn More
    $8.99 Retail Price:  $13.90
  3. M100 Tier1 Plastic Hex Nipple

    M100 Tier1 Plastic Hex Nipple

    Fits standard 1-inch water lines and FPT connections Learn More
    $3.49 Retail Price:  $6.31
  4. M34 Tier1 Plastic Hex Nipple

    M34 Tier1 Plastic Hex Nipple

    Fits standard 3/4-inch water lines and FPT connections Learn More
    $2.99 Retail Price:  $5.74
  5. PFR402Q-150 Tier1 Inline Flow Restrictor

    PFR402Q-150 Tier1 Inline Flow Restrictor

    Fits standard 1/4-inch water lines Learn More
    $10.99 Retail Price:  $13.79
  6. PFR402Q-500 Tier1 Inline Flow Restrictor

    PFR402Q-500 Tier1 Inline Flow Restrictor

    Fits standard 1/4-inch water lines Learn More
    $7.99 Retail Price:  $11.49
  7. QMP502-38 Tier1 Compression Diverter Valve

    QMP502-38 Tier1 Compression Diverter Valve

    Fits standard 3/8-inch water lines Learn More
    $12.99 Retail Price:  $17.24
  8. W2391068 Doulton Diverter valve

    W2391068 Doulton Diverter Valve For Countertop Water Filters

    Fits all Doulton plastic countertop (HCP) water filtration systems Learn More
    $36.99 Retail Price:  $39.34
  9. 1SA Rusco Spigot Adapter Bushing

    1SA Rusco Spigot Adapter Bushing

    Built to fit onto a 1-inch pipe Learn More
    $3.99 Retail Price:  $6.89
  10. 155003 Pentek Water Filter Cartridge Coupler

    155003 Pentek Water Filter Cartridge Coupler

    For use with open-end water filter cartridges, 2.5 inches wide Learn More
    $3.99 Retail Price:  $11.49
  11. PI2308S Tier1 Two-Way Divider (1/4 Inch with Quick Connect Fittings)

    PI2308S Tier1 Two-Way Divider (1/4 Inch with Quick Connect Fittings)

    Attaches to 1/4 inch tubing Learn More
    $1.99 Retail Price:  $3.44
  12. ELF-VALVED-HEAD-KK Omnipure Valved Water Filter Head

    ELF-VALVED-HEAD-KK Omnipure Valved Water Filter Head

    Accepts all Omnipure water filters in the E, ELF and ELF-XL Series Learn More
    $17.99 Retail Price:  $22.99
  13. ASV-ERP-JG Tier1 Automatic Shut-Off Valve

    ASV-ERP-JG Tier1 Automatic Shut-Off Valve

    Fits standard 1/4-inch water lines Learn More
    $17.99 Retail Price:  $22.99
  14. ASV-14QW Tier1 Automatic Shut-Off Valve

    ASV-14QW Tier1 Automatic Shut-Off Valve

    Fits standard 1/4-inch water lines Learn More
    $7.99 Retail Price:  $11.49
  15. W2395982 Doulton Replacement Knob
  16. 2186494W Whirlpool Refrigerator Water Filter Cap - White

    2186494W Whirlpool Refrigerator Water Filter Cap - White

    For use in side-by-side refrigerator models from Whirlpool, KitchenAid, Maytag and Kenmore that use a quarter turn filter, installed in white the lower bottom grille Learn More
    $12.99 Retail Price:  $17.24
  17. 2260518B Whirlpool PUR Refrigerator Water Filter Cap - Black

    2260518B Whirlpool PUR Refrigerator Water Filter Cap - Black

    Fits into Whirlpool, KitchenAid, Kenmore, Amana, Maytag and Jenn-Air side-by-side refrigerator models with a push-button filter located in the black bottom grille Learn More
    $22.99 Retail Price:  $27.59
  18. 2260518W Whirlpool PUR Refrigerator Water Filter Cap - White

    2260518W Whirlpool PUR Refrigerator Water Filter Cap - White

    Replacement part designed to match caps used in the white bottom grille of Whirlpool, KitchenAid, Kenmore, Amana, Maytag and Jenn-Air side-by-side refrigerator models with a push-button filter Learn More
    $16.99 Retail Price:  $27.59
  19. ADAPTER GE SmartWater Filter Adapter
  20. 3M Aqua-Pure 68998-31 Water Filter Coupler

    68998-31 3M Aqua-Pure Water Filter Coupler

    $4.99 Retail Price:  $8.96
  21. BF-34 Culligan Brass Fitting Kit

    BF-34 Culligan Brass Fitting Kit

    Fits 1/2-inch and 3/4-inch pipe Learn More
  22. FVK-100 Culligan Inline Water Filter Flush Valve Kit

    FVK-100 Culligan Inline Water Filter Flush Valve Kit

    Fits Culligan in-line refrigerator filters including IC-750 and IC-1000 Learn More
    $14.99 Retail Price:  $19.54
  23. RV-BYP-EZ Culligan RV Bypass Fitting Adapter

    RV-BYP-EZ Culligan RV Bypass Fitting Adapter

    Fits Culligan Easy-Change filter systems including RV-EZ-1, RV-EZ-2, and RV-EZ-4 Learn More
  24. W2110880 Doulton Candle Replacement Washer

    W2110880 Doulton Ceramic Candle Filter Replacement Washer

    Fits all Doulton long mount filter candles Learn More
    $3.99 Retail Price:  $6.34
  25. W2395740 Doulton Cobra Clip

Items 1 to 25 of 27 total

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