Dock Edge Cone Head Piling Cap 8" PVC | 91871F

Dock Edge Cone Head Piling Cap 8" PVC — Part #91871F

Cap and protect the top of your 8" dock pilings with the Dock Edge 91871F Cone Head Piling Cap. Made from marine-grade PVC, this cap fits snugly over the top of a wood piling, shielding the exposed grain from rain, UV, and moisture — the main culprits behind piling top rot and splintering. The cone-head profile channels water off cleanly and gives your dock a consistent, finished appearance from the waterline up.

Part Details

• Part Number: 91871F (store SKU: 686-91871F)
• Brand: Dock Edge
• Product Type: Cone Head Piling Cap
• Material: Marine-grade PVC
• Piling Diameter: 8 in.
• Style: Cone head (tapered top for water shedding)

Compatible Applications

• Round wood dock pilings with an 8" diameter at the top
• Fixed and floating dock piling installations
• Marina berth pilings, private dock pilings, and mooring pile structures
• Fitment note: Measure your piling diameter at the top before ordering — not at the waterline, as pilings often taper. Dock Edge offers cone head caps in multiple sizes; see Related Products below for other diameter options.

Dimensions

• Fits: 8" diameter pilings
• Profile: Cone head (tapered top)
• Approximate weight: 1.4 lbs (653 g)

System

Dock piling protection — installed on the exposed top of a wood dock piling to prevent weather-driven deterioration at the most vulnerable point of the structure.

Installation Notes

• Inspect the piling top before installing — trim or dress uneven, cracked, or partially rotted surfaces for a stable cap fit
• The cap should sit flush and firm without rocking; rocking indicates a size mismatch or uneven piling top
• No fasteners required for a standard friction fit; in high-wave or high-wind environments, apply a bead of marine-grade sealant around the inside rim for added retention
• Do not trap standing water under the cap edge — ensure the rim seats cleanly to the piling top

Service Interval

Inspect annually at season start. Look for UV cracking, fading, or loosening caused by wood movement. Replace if cracking is visible to maintain effective protection of the piling top.

Related Products — Other Piling Cap Sizes

• Dock Edge DE91802F — 10" Cone Head Piling Cap
• Dock Edge DE91811F — 11" Cone Head Piling Cap
• Dock Edge DE91812F — 12" Cone Head Piling Cap
• Dock Edge DE91822F — Cone Head Piling Cap
• Browse all Docking & Mooring Hardware

Technical FAQ

• How do I measure for the right cap size? Measure the outer diameter of your piling at the very top (the cap installation point), not at the base or waterline. Pilings taper — the top is often smaller than the base.
• Will a small taper affect the fit? A minor taper is normal for wood pilings and the cone-head cap can accommodate slight variation. If the piling top is severely tapered or irregular, dress it flat before installing the cap.
• Is UV protection built in? Dock Edge marine-grade PVC includes UV stabilizers for outdoor durability. Inspect annually and replace when surface cracking appears.
• Do I need screws or adhesive? No — the cap is designed as a friction fit. Marine sealant around the inner rim is optional for extra security in exposed locations.

Parts Desk Insights

The 8" cone head cap is the right pick for smaller-diameter dock pilings common on older private docks and lighter floating dock systems. The most important thing to get right is the size — always measure at the top of the piling, not at the base. A cap that's too large will rock and collect water rather than shed it, which defeats the purpose entirely. If you're unsure of your piling size, we recommend bringing a measurement or a photo of the piling top when you order.