Overview

The Attwood Marine SP-67904 is a 9 inch round aluminum Snap-Lock seat pedestal base for boats that use the 1.77 inch seating system. It gives you a fixed deck base for a removable pedestal post, and its 3 inch below-deck depth is worth checking when you are planning space under the mounting surface.

This base is used as a replacement when an older seat base is worn, or when you want to add another seating position without changing the rest of a compatible Snap-Lock setup. It fits the kind of seating layout commonly seen on fishing boats, pontoons, and cruising boats where a seat post needs to lock in firmly and come out when the deck needs to stay open.

Key features

• 9 inch round base plate for Attwood and Swivl-Eze 1.77 inch Snap-Lock pedestal posts
• Aluminum construction for a deck-mounted seat base that keeps weight reasonable
• Snap-Lock connection with locking clip to help keep the post engaged during normal use
• 3 inch below-deck depth, which matters when checking clearance under the deck or liner
• Useful for seat base replacement or for adding another seating position on compatible boats

Compatibility and fit

Fit is the main thing to confirm before ordering. This base belongs to the 1.77 inch Snap-Lock family, so it should be matched with the correct pedestal post and seat mount from that same standard rather than threaded bases or larger pedestal systems. The 9 inch round footprint also helps when you are comparing it to an older base on the deck.

Installation and use on board

On board, this style of base makes sense where a seat needs to go in and out without leaving a tall pedestal in place all day. It works well in helm, cockpit, and casting locations where deck space matters once the post is removed. Before drilling or swapping an older base, check the post diameter, the footprint on deck, and the available clearance below the mounting surface.