Thru-Hull Fittings

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!

Thru-Hull Fittings

Forespar Marelon Full-Flow Seacock with Stainless Cap Thru-Hull

Groco HSSLTH Series Slotted High Speed Pickup Thru-Hull Fitting with Nut

Sea-Dog Thru-Hull

Forespar Pro Series Buttress Thread Thru-Hull Connector

Forespar CF 249 Thru-Hull Nut

Forespar CF 254 Marelon Flush Head Thru-Hull Barb Connector

Forespar CF 253 Marelon Mushroom Head Screened Thru-Hull Barb Connector

Forespar MF 866 Scoop Strainer Screen - 1 1/4" - 906062

Forespar CF 249 BSP Thread Thru-Hull Nut - 2" - 920383

Forespar Thru Hull Speed Scoop Kit - 906060SS

Whitecap Duraplex 90 deg. Stainless Steel Thru-Hull

Whitecap Duraplex Stainless Steel Thru-Hull

Vetus Delrin Thru-Hull Fitting

Seachoice Cable Thru-Hull Fitting

Seachoice Stainless Steel Mega-Flow Dripless Thru-Hull Fitting

Seachoice Stainless Steel Covered Thru-Hull Fitting

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

Seachoice Thru-Hull Connector with Broad Flange

Seachoice Thru-Hull Connector

Seachoice Thru-Hull Connector with Two Nut Application - 90 deg.

Seachoice Extra Long Thru-Hull Connector

Seachoice Thru-Hull Strainer Mount - 18191

Perko Narrow Flange Thru-Hull Hose Connector

Perko Thru-Hull Pipe Connector

Perko Broad Flange Thru-Hull Connector

Perko Extra Long Thru-Hull Connector

Perko Thru-Hull Hose Connector

Perko Thru-Hull Scupper - 1 1/2" - 0323DP

Attwood Plastic Thru-Hull Fitting - 90 deg.

Attwood Stainless Steel Barbed Thru-Hull Fitting

Attwood Thru-Hull Fitting with Strainer - 3886-3

Groco Combo HSTHXL Series High Speed XL Pickup Thru-Hull Fitting with Nut

Groco HTHC Series Hose Thru-Hull Fitting - 90 deg.

Groco HSTH Series Combo High Speed Pickup Thru-Hull Fitting with Nut

Groco APHS Series Bronze Hull Scoop Strainer with Access Door

Vetus Stainless Steel Water Scoop

T-H Marine Straight Thru-Hull Fittings

T-H Marine Thru-Hull Fittings - 3/4" - 90 deg.

Forespar Scoop Strainer

Attwood Plastic Mushroom Head Thru-Hull Fitting

Whitecap Stainless Steel Thru-Hull with Barb

Whitecap Straight Thru-Hull with Barb

Whitecap Long Neck Thru Hull - 6554

Whitecap Nylon Thru Hull with SS Flange Cover - S-3813

Whitecap Plastic Mushroom Head Thru-Hull Fitting with SS Flange

Whitecap 316 Stainless Steel Thru Hull

Whitecap SS Thru-Hull with Barb - 90 deg. - 6579

Whitecap Thru-Hull with Barb - 90 deg.

About Thru-Hull Fittings

Thru Hull Fittings & Tools

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

The trials and tribulations of boat thru hulls and strainers.

This thru hull fitting is made of what?

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