Black Aluminum In-line Post Cap for Smooth Continuous Line Railing

This in-line post cap is an easy way of instantly elevating your outdoor space. Minimal yet stunning features effortlessly add a clean look to your railing. Its timeless appearance and marine grade aluminum construction make it as good looking as it is durable and easy to clean.

UPC CODE: 664723440522

Looking for an easy way to elevate your outdoor space? Our aluminum railing is virtually maintenance free and features a modern yet classic design.

  • Not only is this a safe and durable option for your outdoor space, it cleans easily with soap and water and will look great for many years to come.
  • This in-line post cap is used with our black aluminum deck railing kits to create a clean and modern look to your deck railing. When it comes to installation, we include the post cap and fasteners. Easy-to-follow instructions are available in the deck kits. Whether you’re a busy contractor or a DIYer looking for an easy backyard upgrade, these post caps will be perfect for you.
  • Don’t waste your time maintaining your deck or porch. Upgrade to our aluminum railing line so you can spend your time enjoying all its benefits and your new space for years to come.


  • DESIGNED FOR | These caps are used to prevent the top of your post from extending out past your rail, creating a smooth, continuous line railing in the process.
  • 36″ SMOOTH RAILING | For 36″ high smooth, continuous line railing: use this post cap on our (BLPOP33) surface mount posts and with our deck kits (BLSARK636D and BLSARK836D) (sold separately)
  • 42″ SMOOTH RAILING | For 42″ high smooth, continuous line railing: use this post cap on our (BLPOP39) with our deck kits (BLSARK842D and BLSARK842D) (sold separately)
  • MATERIAL & FINISH | This durable in-line post cap is made from marine grade aluminum and features a powder coated and thermally bonded black satin finish
  • PROJECT VERSATILITY | We designed our aluminum railing line to accent and blend perfectly into both modern and classic project designs.
  • LOW MAINTENANCE | Our aluminum railing line cleans easily with soap and water, making maintenance simple
  • WHAT’S INCLUDED | One (1) in-line post cap and fastening screws
  • QUALITY YOU CAN DEPEND ON | We are confident in the quality of our product and that’s why it’s backed by our limited 20-year warranty.
  • COHESIVE LOOK | Want your entire deck railing profile to be smooth top? Use our in-line corner post cap (BLCPC90) and our in-line end post cap (BLEPC) (sold separately)
  • MIX N’ MATCH | Get creative and mix and match the different styles of our aluminum railing line. All featuring the same finish and height, using different picket styles with our glass panels is both convenient and good looking.


  • UV-Protected | prevents fading and discolouring caused by the sun’s harsh rays
  • Rust-Resistant | its durable aluminum construction and powder coated finish prevent peeling and blistering
  • Weather Protected | designed to last through North America’s harshest conditions
  • Compatible materials include wood, vinyl, composite, metal/aluminum, and concrete/paving stones/bricks
  • In addition to the beauty and post protection it offers, the installation process is quick and intuitive.
  • We offer our aluminum railing line in two equally stunning colours: choose from either classic black or crisp white.
  • Ideal for use in low to high traffic locations
  • Ideal for contractors and DIYers
  • Moderate skill set required for installation
  • Estimated installation time: 5 minutes
  • Perfect for residential, commercial, and industrial use
  • Prior to construction, check with your local municipality for building code requirements in your area.
  • Materials and packaging are fully recyclable
  • Limited twenty (20) year warranty.