Attwood Marine 238 Series Fixed Height Seat Extension Posts, 2-3/8 in Diameter, Hard-Anodized Aluminum

Overview

The Attwood Marine 238 Series Fixed Height Extension Posts is a range of fixed boat seat pedestal extension posts for Attwood 238 Series seating hardware. These 2-3/8-inch posts are used when a boat seat needs a fixed seating height rather than an adjustable pedestal, making them a practical fit for helm seating, fishing seats, pontoon layouts, and general cockpit seating where the base and seat mount are already part of a compatible 238 Series setup.

The posts are made from super-hard anodized aluminum alloy and use stainless-steel springs, giving the seating system support that is suited to wet marine spaces and regular use on board. The available heights in this range run from 8 inches to 30 inches, measured from the deck to the top of the seat mount, so the correct option depends on the seating position, sightline, and deck layout.

These posts are not recommended for mixing with other manufacturers' pedestal systems. For a proper fit, match the post to a 2-3/8-inch Attwood 238 Series socket base and compatible seat mount.

Key features

• Fixed-height extension post for boat seat replacement or new seat pedestal installations.
• 2-3/8-inch post size for compatible Attwood 238 Series socket bases.
• Super-hard anodized aluminum alloy tube helps resist corrosion in marine seating areas.
• Stainless-steel spring components support dependable locking action in a wet cockpit or deck environment.
• Smooth release button reduces effort when unlocking the post from the base.
• Height options cover low cockpit seating through taller helm or leaning-style positions, depending on the selected variant.
• Meets Type A driver-side lateral strength requirements where the selected configuration is rated for helm use.

Variants

This range varies by fixed post height. The height options supplied for this product run from 8 inches through 30 inches, with the measurement taken from the deck to the top of the seat mount. Shorter heights are commonly used where the seat needs to stay closer to the deck, while taller heights can improve visibility and seating posture at the helm or in open cockpit layouts.

The core construction and 2-3/8-inch 238 Series fit remain consistent across the range, but the correct variant should be matched to the boat's existing base, seat mount, and the seating height needed at that location. These posts should stay within the Attwood 238 Series system rather than being interchanged with hardware from other pedestal brands.

Installation and fit

Before installation, confirm that the deck base is a compatible Attwood 238 Series 2-3/8-inch socket base and that the seat mount used above the post matches the same system. The post should lock fully into the base, with no unwanted movement, before the seat is used underway.

Height choice matters on a boat. At the helm, the seat position should give a clear view over the dash, windshield, and bow while still allowing safe reach to the wheel, throttle, electronics, and switches. In fishing or cockpit seating areas, the post height should leave enough clearance for rotation, foot placement, and movement around the deck.

Use on board

This series is a good match for boat owners replacing an existing 238 Series post or setting up a fixed seat height where adjustment is not needed. It works well in layouts where simple removal from the base, a clean seating position, and corrosion-resistant aluminum construction matter more than powered or adjustable height features.