Thru-Hull Fittings

  1. Groco Combo Thru-Hull Fitting with Nut

    $15.94 - $757.99
    1
  2. Forespar 253 Series Marelon Mushroom Head Thru-Hull Fitting

    $15.96 - $35.96
    1
  3. Groco Bronze Scoop Thru-Hull Strainer with Nut

    $24.99 - $173.99
    0
  4. Groco SC Series Bronze Clam Shell Style Hull Strainer

    $29.99 - $236.99
    0
  5. Groco APHS Series Bronze Hull Scoop Strainer with Access Door

    $179.99 - $399.99
  6. Groco HTH Series Hose Barb Thru-Hull Fitting

    $17.29 - $72.99
    2
  7. Groco Combo XL Thru-Hull

    $26.99 - $81.99
    0
  8. Andersen Automatic Bailer

    $78.99 - $141.99
    0
  9. Forespar CF 251 Series Marelon Mushroom Head Thru-Hull Fitting

    $15.96 - $38.36
    1
  10. Groco RSC Series Round Hull Strainer

    $61.99 - $434.99
    0
  11. 10% off

    Whitecap Stainless Steel Thru-Hull with Barb

    $24.99 - $77.99
    $22.49 - $77.99
    0
  12. Groco HTHC Series Hose Thru-Hull Fitting - 90 deg.

    $37.99 - $137.99
  13. Forespar CF 250 Series Marelon Flush Head Thru-Hull Fitting

    $14.36 - $28.76
    0
  14. Forespar CF 254S Marelon Flush Head Deck Drain/Thru Hull with Screen

    $18.36 - $40.76
    0
  15. 46% off

    Whitecap Plastic Mushroom Head Thru-Hull Fitting with SS Flange

    $11.30 - $29.99
    $9.15 - $29.99
    0
  16. 39% off

    Whitecap Thru-Hull with Barb - 90 deg.

    $5.49 - $6.71
    $3.38 - $6.71
    1
  17. SHURflo Livewell Fill Valve - 330-021

    $38.99
    2
  18. Groco ASC Series Slotted Hull Strainer

    $152.99 - $1,054.99
    0
  19. Groco TH Series Thru-Hull Lock Nut

    $7.20 - $317.99
    0
  20. Groco FTH Series Bronze Flush Mount Thru-Hull Fitting

    $18.81 - $55.99
    0
  21. Whitecap Long Neck Thru Hull - 6554

    $77.99
    0
  22. Attwood Plastic Mushroom Head Thru-Hull Fitting

    $5.06 - $9.14
    0
  23. Forespar Scoop Strainer

    $31.16 - $33.56
    0
  24. 16% off

    Whitecap 316 Stainless Steel Thru Hull

    $41.99 - $107.99
    $41.99 - $91.99
    0
  25. Attwood Stainless Steel Barbed Thru-Hull Fitting

    $20.99 - $51.99
  26. Groco HSTH Series Combo High Speed Pickup Thru-Hull Fitting with Nut

    $18.05 - $832.99
  27. Perko Thru-Hull Hose Connector

    $28.99 - $91.99
  28. Vetus Stainless Steel Water Scoop

    $31.99 - $88.99
  29. 48% off

    Whitecap Straight Thru-Hull with Barb

    $4.99 - $6.22
    $2.80 - $6.22
    1
  30. T-H Marine Thru-Hull Fittings - 3/4" - 90 deg.

    $6.93 - $9.62
    0
  31. Whitecap SS Thru-Hull with Barb - 90 deg. - 6579

    $57.99
    0
  32. Attwood Plastic Thru-Hull Fitting - 90 deg.

    $7.84 - $13.00
  33. Perko Thru-Hull Pipe Connector

    $32.99 - $241.99
  34. Vetus Delrin Thru-Hull Fitting

    $11.58 - $24.99
  35. T-H Marine Straight Thru-Hull Fittings

    $5.84 - $15.38
    1
  36. Groco Combo HSTHXL Series High Speed XL Pickup Thru-Hull Fitting with Nut

    $27.99 - $86.99
  37. Whitecap Nylon Thru Hull with SS Flange Cover - S-3813

    $25.99
    0
  38. Rule Acetal Resin Mushroom Head Thru-Hull Fitting - 61

    $11.53
    0
  39. Rule Acetal Resin Mushroom Head Thru-Hull Fitting - 1 1/8" - 60

    $12.92
    0
  40. Perko Broad Flange Thru-Hull Connector

    $4.37 - $8.47
  41. Seachoice Thru-Hull Connector with Broad Flange

    $4.75 - $10.11
  42. 15% off

    Apollo Conbraco 65-Series Bronze Thru-Hull Flanged Retainer Nut

    $2.53 - $20.00
    $2.15 - $18.00
    0
  43. Attwood Thru-Hull Fitting with Strainer - 3886-3

    $14.06
  44. Perko Thru-Hull Scupper - 1 1/2" - 0323DP

    $38.99
  45. Perko Narrow Flange Thru-Hull Hose Connector

    $6.17 - $15.13
  46. Perko Extra Long Thru-Hull Connector

    $74.99 - $79.99
  47. Seachoice Thru-Hull Strainer Mount - 18191

    $13.15
  48. Seachoice Thru-Hull Connector with One Nut Application - 90 deg.

    $6.82 - $13.15
 
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About Thru-Hull Fittings

Thru Hull Fittings & Tools

Defender Marine offers a full line of thru hull fittings fabricated in a variety of materials. From ½ inch up to 5 inches, our boat thru hulls are the key to successfully rigging any type of intake/discharge pump above or below the waterline. Washdowns, circulating pumps and even saltwater cooled engines depend on the correct size boat thru hull, strainer, valve, and reinforced hose system. Strainers in several shapes, as well as tools to facilitate thru hull installation, are also available at Defender Marine.

What's the best way to install a marine thru hull fitting?

Remember that old adage - slow and steady wins the race? Well, there is no location on a boat to be more careful and slower than installing thru hulls below the waterline. First things first - haul your boat and let it settle, especially if it has a wooden hull. Next, get all of your details straight before you dig out that hole saw! Match pipe thread, determine if your job needs a seacock, fabricate and fit a backing plate and confirm that your metals are compatible to avoid electrolysis. Finally, make certain that all adhesives and sealants have cured prior to going back to the water!

The trials and tribulations of boat thru hulls and strainers.

Isn't it great when an overheated pump turns out to be a clogged or blocked strainer instead of an issue that requires a mechanic and all of his tools? Marine thru hull systems offers several layers of protection for your intake and the expensive mechanical equipment beyond. Strainers and thru hulls with strainer systems from Defender come in several shapes sizes and keep large debris from entering through the hull.

This thru hull fitting is made of what?

Defender offers thru hull fittings made of just about anything. There are several items to consider when choosing your boat thru hull. The most important is the strength of your fitting; in some applications, a seacock or backing plate may strengthen your project. The next is electrolysis. When it comes to boats, electrolysis is part of life, but boat thru hull fittings are normally located under the waterline where metals react more severely. Be certain metals are compatible or use plastic or Marelon thru hull fittings - these are guaranteed not to pit!