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Product Details

Attwood Thru-Hull Connectors are constructed from high impact rugged white plastic. They will not rust corrode, discolor or contribute to electrolysis. Design eliminates hull streaking and allows countersinking wherever a flush fit is required. Maximum hull thickness is 1-1/4in.

Not for below waterline use.

Tech Specs
Item #Hose Size"Stem"Flange"Hole"
ATT 387235/8in Straight3-1/4in1-1/4in1-1/8in
ATT 387333/4in Straight3-1/4in1-1/4in1-1/8in
ATT 387733/4in 90degree3-1/4in1-1/4in1-1/8in
ATT 387431-1/8in Straight3-1/4in2-1/4in1-3/8in
ATT 387911-1/8in 90degree3-1/4in2-1/4in1-3/8in
ATT 387531-1/2in Straight3-1/2in3in1-7/8-2in
Info & Guides

WARNING: These products may contain chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to

Reviews for Attwood Thru-Hull Connectors

3 of 3 Reviews

December 17, 2016

It would be really nice to know what size on both ends.
By Me from Sc

Haven't ordered one because there's not enough info on what size they are. I need an 1 1/2 on threaded end . And 1 1/8 on barbed end. Confused on how to order because of lack of info on what you are buying.

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June 18, 2015

Great Product
By Bob M from Monroe, Michigan. Lake Erie

Verified Purchase

Attractive Accurate Well Made.

Bottom Line Yes, I would recommend to a friend

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October 25, 2012

Good product- well made & cost effective
By Gene from Pittsburgh, PA

Product was used to add a drain to a humidifier holding tank so that the tank could be drained for easier removal. Drain was connected through a shut off valve to an existing 5/8 inch vinyl tube. Had to buy a neoprene washer to make it leak tight. Two humidifiers were modified and the total cost of the parts was less than $15 for each tank.

Bottom Line Yes, I would recommend to a friend

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