30-day postage paid returns
        Free shipping special for you
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          • Attwood SP-37904 2" Wedge Extension Post - 13" to 19"
          1 / 24

          Attwood SP-37904 2" Wedge Extension Post - 13" to 19"

          $42.00 USD
          Shipping fees will be calculated at checkout.
          Size
          Style

          • Free worldwide shipping

          • Free returns

          • Carbon neutral

          • Secure payments

          • 13" TO 19" HEIGHT ADJUSTMENT: Features a 2-3/8 inch diameter extension post with an adjustable height mechanism that smoothly shifts from 13 to 19 inches, letting you customize your seating comfort on the water.
          • SECURE WEDGE BUSHING SYSTEM: Locks the seat post tightly into the base with a solid fit, while an integrated locking tab positively prevents accidental or dangerous detachment.
          • CORROSION-RESISTANT ALUMINUM: Constructed from high-strength marine-grade aluminum with a premium satin anodized finish that resists harsh saltwater corrosion and weathering.
          • HEAVY-DUTY CRUSH RIB STABILITY: Built with an advanced peripheral bearing system and exclusive "crush ribs" that are individually sized to eliminate post wobble and guarantee an exact fit.
          • ABYC CODE B COMPLIANT: Fully certified to meet safety standards for passenger boat seating hardware on open water.
          UPC014599379058
          ColorSilver
          Fit TypeVehicle Specific Fit
          MaterialAluminum
          Seat Depth2.38 inches
          Unit Count1 Count
          Seat Height19 inches
          ManufacturerAttwood
          Model NumberSP-37904
          Material TypeAluminum
          Item Type Nameboat-seating-accessories
          Automotive Fit TypeVehicle Specific Fit
          Included ComponentsAdjustable pedestal post, Integral Type-B seat mount, wedge-style bushing system, Peripheral bearing system with crush ribs
          Auto Part OrientationPassengers Side
          Manufacturer Part NumberSP-37904
          Compatible With Vehicle TypeBoat
          Compatible with Vehicle TypeBoat
          Global Trade Identification Number00014599379058
          Attwood Banner, boat on water, marine electronics
          Attwood, Boat Seating, Padded Boat Seat

          What makes Attwood different:

          • A proven marine industry leader for over 100 years.
          • Wide range of products, including general marine accessories, seat & table hardware, and water systems & ventilation.
          • Tested to the highest USCG, ABYC, and CE standards.
          • Quality is our highest priority.

          Why Attwood?

          Attwood, Boat Seats, Fishing Seats, Fishing, Freshwater

          Safety

          Attwood is an avid partner for regulatory compliance. Our products will always meet safety and compliance standards, keeping our customers safe and enjoying their time on the water.

          Boat Seats, Attwood, Fishing Seats, Freshwater Fishing, Boat Seats

          Reliability

          We provide leading Boating & Marine products and services that are easy to use. Made of premium materials, our products are extensively tested to provide care free boating under all conditions.

          Boat Seats, Attwood, Fishing Seats, Freshwater Fishing, Jon Boats, Fishing Boats

          Trusted Supplier

          Attwood is a premium supplier of genuine boat replacement parts. The quality we deliver has allowed us to be trusted by boat manufacturers across the United States.

          Attwood, Marine, Logo, A

          The Attwood Promise

          Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing of quality boating/marine products for over 100 years. We provide genuine OEM replacement parts delivering safe and reliable lighting, fuel systems, water systems, seating & pedestals, and general marine accessories that are easy to install and meet regulatory compliance.

          Example title

          You may also like

          Recently viewed

          Service

          Fast and free delivery
          Lifetime customer support
          30 day refund guarantee

          Return policy | Privacy Policy | Shipping Policy | Terms of Service |
          © 2026 Twipik. All Rights Reserved.

          Cart

          loading