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Internet # 300255825

Model # 103800HD

Store SKU # 518948

Model RV Type B Gas Vent 3in. Steel Round Gas Vent Top

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  • Round top design helps prevent the entry of most bird species
  • Available for 3 in. - 8 in. diameters
  • For use with vertical installations only
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Product Details

About This Product

The 3 in. Steel Round Gas Vent Top helps prevent rain and debris from entering the vent and is not approved or recommended for wood-burning applications. It is a durable, galvanized-steel Type B fitting for use on approved gas appliances in residential, light commercial and industrial applications. This fitting is formed for uniform sizing and a strong, easy-to-connect joint. It is tested and UL listed for safety in accordance with NFPA standards.

Highlights

  • Strong, durable galvanized steel
  • Helps prevent rain and debris from entering the vent
  • Not to be used for wood-burning applications
  • Lock tab feature can be used instead of sheet-metal screws for ease of installation
  • Uniform sizing and a strong, easy-to-connect joint
  • Tested and listed per UL 441 for installation in single and multi-story buildings
  • Type B gas vent is also referred to as b vent or type b vent
  • Some common applications may include warm air furnaces, tank water heaters, residential boilers, common vented appliances and more
  • Used on gas-fired category I natural draft appliances
  • Return Policy

Product Information

Internet # 300255825

Model # 103800HD

Store SKU # 518948

Additional Resources

Shop All Selkirk

Specifications

Dimensions: H 6.75 in, W 2.88 in, D 4.75 in

Dimensions

Product Depth (in.)

4.75 in

Product Height (in.)

6.75 in

Product Length (in.)

2.88 in

Product Width (in.)

2.88 in

Details

Material

Galvanized Steel

Pack Size

1

Warranty / Certifications

Manufacturer Warranty

Limited Lifetime Warranty

Questions & Answers

4" vent pipes actually have a outside diameter of 4.5" Will this fit that?
ByOct 13, 2026
1 Answer | 
Answer This Question

4" bvent will work with a 4" bvent cap

By|Oct 13, 2026


    Are screws supposed to be used to install the B-vent double wall pipe elbows with two and 3 foot pieces
    ByOct 7, 2026
    1 Answer | 
    Answer This Question

    The 6" bvent connection is a snap lock. Our website has our full install instructions with information on when its approved to use screws. Selkirkcorp.com

    By|Oct 8, 2026


      Is the opening of the cap 5inches?
      ByDec 1, 2024
      2 Answers | 
      Answer This Question

      NO, its not. I just bought one for my 4" pipe and it measures 4" to the outside.

      By|Dec 2, 2025

        Yes. Though it is actually sized to slide to the inside of the 5" ID pipe.

        By|Dec 3, 2024


          Can this cap be mounted vertically? My flue is coming out of a side wall
          ByOct 29, 2024
          1 Answer | 
          Answer This Question

          This cap is only to be mounted vertically. It is for use with Type B Gas Vent on Category I, natural draft appliances that need to terminate vertically above the roof. Unless specifically detailed in an appliance manual, this cap isn't intended to be installed horizontally.

          By|Oct 30, 2024


            Does this twist lock on to Selkirk pipe?
            ByFeb 21, 2024
            1 Answer | 
            Answer This Question

            This cap does not twist-lock onto the pipe. It slides to the inside of the B Vent. There is a securing clip under the lower skirt of the cap that will then engage with the upper, inside edge of the pipe.

            By|Jun 16, 2026

              (3)

              will this help with downdrafts ?
              ByFeb 16, 2024
              1 Answer | 
              Answer This Question

              This cap is designed to offer protection from debris & birds as well as offer assistance for removal of flue gases. It is approved for use with Category I appliances (natural draft & non-condensing units).

              By|Feb 19, 2024


                Does this cap prevent wind from blowing out hot water heater pilot.
                ByJan 24, 2024
                1 Answer | 
                Answer This Question

                This Round Top has been tested and safety certified per Underwriters laboratories, Inc., which includes a wind test. The design of this cap offers a venturi effect, helping to pull the flue gases out the last few feet of the run. However if your installation is in a high wind area, you might want to consider the High Wind Cap (for a 5" diameter pipe, the part number would be 5RV-HWT / #105802.). It has a large wind band around the outside of the cap to block the wind, reducing possible affects to the draft. If you'd like more details, feel free to contact our Technical Team at 800-748-0392 opt. 5.

                By|Jan 24, 2024


                  Does is adjust to a 5 1/2 inch?
                  ByDec 10, 2023
                  1 Answer | 
                  Answer This Question

                  This is designed to slide to the inside of a 6" inside diameter B Vent. There is no built-in adjustability to make it go down to 5.5".

                  By|Dec 12, 2023


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                    Customer Reviews

                    4.4 out of 5

                    • 4.4 out of 89 reviews
                    • 75% recommend this product
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                    Great price and product. Perfect fit.
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                    Product did what we expected and fit well. The only downside was that the metal seemed a little thinner than we would have liked to stand up against hail damage, etc.
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                    Product Snapshot

                    Ideal for homeowners looking for durable gas vent tops, ensuring easy installation and weather protection.
                    Ideal for gas appliance venting, ensuring safety and easy installation with its durable galvanized steel construction.
                    Ideal for gas appliances, this durable galvanized steel vent top prevents debris entry, ensuring safe and efficient venting.

                    Size/Capacity

                    3 in. diameter, H 6.75 in., D 4.75 in., L 2.88 in.
                    5 in. x 12 in.
                    6 in. Dia

                    Pressure Rating

                    Temperature Rating

                    Corrosion Resistance

                    Leak Prevention