Stainless Steel Thru-Hull Standard Straight Barbed – 1″ Inner Diameter
Polish your image with these beautiful, durable stainless steel fittings. Why specify plastic parts when these fittings will last the life of the boat?
Rugged Stainless Construction:
- Cast from certified Enhanced 316 Stainless Steel alloy for strength and lifetime corrosion-resistance
- All visible areas are polished to a mirror finish, then passivate each part for additional protection
- Thick steel sidewalls withstand continual stress and hose flexing
Faster, Simpler Installation:
- Each Thru-Hull is available with a new silicone gasket
- A channel under the flange holds a bead of sealant, making it easier to apply a trouble-free seal
- All models have wrench flats or an end notch to hold as a gripping surface; one installer can tighten all connections from inside the hull
- The barbed tail ends provide plenty of room to hold multiple clamps
Stainless Steel Straight Thru-Hulls, Barbed
- Standard Thread model has a full-length thread for thick hulls and easy tightening
Specifications:
- Hose size: (inch) 1″ inner diameter
- Flange Diameter: (inch) 2-1/4″
- Thread O.D. (outside diameter): (inch) 1-3/8″
- Thread Length: (inch) 2-1/4″
- Barb Length: (inch) 1-1/4″
- Total Length: (inch) 3-7/8″
- Install Hole Saw Size: (inch) 1-1/2″
- Thread NPSM: (inch) 1″
- Max Hull Thickness: (inch) 1-3/4″
*Stainless Steel Thru-Hull Connectors are designed for installation above the water line only
Specifications:
- Hose Size: 1″
- Material: Stainless Steel
- Box Dimensions: 3″H x 4″W x 7″L WT: 0.8 lbs
- UPC: 022697665485
Quick Guide (pdf)

![Perko 1" Thru-Hull Fitting f/Hose Bronze MADE IN THE USA [0350006DPP]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/perko-1-thru-hull-fitting-f-hose-bronze-made-in-usa-0350006dpp.webp)
![GROCO 2-1/2" Bronze Thru-Hull Fitting w/Nut [TH-2500-W]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/groco-2-1-2-bronze-thru-hull-fitting-w-nut-th-2500-w.webp)
![GROCO 3/4" Slotted Hi Speed Thru-Hull w/Nut [HSSLTH-750-W]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/groco-3-4-slotted-hi-speed-thru-hull-w-nut-hsslth-750-w.webp)
![Perko 1-1/8" Thru-Hull Fitting f/ Hose Plastic MADE IN THEUSA [0328DP6A]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/perko-1-1-8-thru-hull-fitting-f-hose-plastic-made-in-theusa-0328dp6a.webp)
![Perko 1/2" Thru-Hull Fitting f/ Hose Plastic MADE IN THE USA [0328DP4]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/perko-1-2-thru-hull-fitting-f-hose-plastic-made-in-usa-0328dp4.webp)
![Perko 1-1/4" Thru-Hull Fitting f/Hose Bronze MADE IN THE USA [0350007DPP]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/perko-1-1-4-thru-hull-fitting-f-hose-bronze-made-in-usa-0350007dpp.webp)
![Perko 5/8" Thru-Hull Fitting f/ Hose Bronze MADE IN THE USA [0350004DPP]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/perko-5-8-thru-hull-fitting-f-hose-bronze-made-in-usa-0350004dpp.webp)
![Perko 3/4" Thru-Hull Fitting f/ Hose Bronze MADE IN THE USA [0350005DPP]](https://www.boataccessorydepot.com/wp-content/uploads/2026/10/perko-3-4-thru-hull-fitting-f-hose-bronze-made-in-usa-0350005dpp.webp)