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Red spherical buoy with blue ropehold, 20.5 inch diameter

POLYFORM

POLYFORM A-Series Buoy A-4 20.5" Diameter Red accessory

SKU CH-3FEA-SC6ET

Red all-purpose buoy, 20.5" diameter, 187 lbs buoyancy for 50–60 ft boats

  • 5" diameter red buoy marks gear clearly in heavy seas
  • 187 lbs buoyancy keeps 50'–60' boat equipment visible and secure
  • Even wall thickness delivers maximum strength for long service life
  • Reinforced ropeholds and vinyl valve system simplify inflation and attachment
  • 4" circumference and 1.0" eye fit standard lines and fender setups

Built for Heavy-Seas Marking

The POLYFORM A-Series Buoy A-4 measures 20.5 inches in diameter and 27 inches in length. It provides 187 lbs of buoyancy and features a 1.0 inch eye diameter. The circumference is 64.4 inches. It is designed for boat sizes between 50 and 60 feet.

Upgrade from Smaller Fenders

This model replaces smaller buoys when gear marking in adverse conditions demands greater flotation. The jump is worth it when operating in heavy seas or rivers where maximum visibility and holding power are required. The redesigned ropehold and dual valve system on larger sizes improve durability for long-term deployment.

Suits Offshore Fishermen and Rafters

This buoy suits commercial and recreational fishermen marking gear in open ocean, sea, or river environments. It also serves well as a rafting fender for vessels in the 50 to 60 foot range. Buyers needing a compact fender for small craft or low-buoyancy applications should look at smaller diameter options.

Highlights

  • 5" diameter red buoy marks gear clearly in heavy seas
  • 187 lbs buoyancy keeps 50'–60' boat equipment visible and secure
  • Even wall thickness delivers maximum strength for long service life
  • Reinforced ropeholds and vinyl valve system simplify inflation and attachment
  • 4" circumference and 1.0" eye fit standard lines and fender setups

Specifications

BrandPolyform U.S.

Questions about this item

Will the 1.0 in eye diameter fit my standard mooring shackle?

The eye measures 1.0 in across, so any shackle or thimble sized for a one-inch opening will pass through cleanly.

How do I inflate the dual-valve system without over-pressurising the buoy?

Open both valves, pump until the wall feels firm but still yields slightly to thumb pressure, then close the valves in the order shown on the moulded label.

When should I replace the vinyl valve assembly on this A-4?

Inspect the valve each season; swap it out if the cap seal cracks, the core leaks air, or the plastic body shows UV crazing.

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