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    • AED5123.jpg

    AED Nylon Needle & Seat Gaskets, Top & Bottom Kit | 5123

    Vendor: Advanced Engine Design
    Part Number: 5123
    $6.88

    Available to order. In-stock orders typically ship in 1 to 2 business days.

    Not sure it fits your vehicle?
    Email sales@berryperformancesales.com with your year, make, model and engine, and we'll help you check fitment before you order.
    Fast Fulfillment: In-stock orders typically ship within 1 to 2 business days.
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    Product DetailsFAQReviewsRelated Products

    AED nylon needle and seat gaskets seal the top and bottom of the needle and seat assembly on Holley carburetors, preventing fuel leaks around the fitting. The kit covers both the 0.25 in and 0.375 in gasket sizes used across Holley needle and seat assemblies.

    Specifications:

    • Sizes: 0.25 in and 0.375 in ID
    • Thickness: 0.031 in
    • Material: Nylon
    • Position: Bottom / top
    • Application: Holley carburetors
    • Sold: Kit
    • Part Number: 5123

    FAQ

    What sizes of gaskets are in the 5123 kit?

    Both 0.25 in and 0.375 in ID gaskets, 0.031 in thick.

    Where do these gaskets go?

    On the top and bottom of the needle and seat assembly on Holley carburetors.

    What material are the 5123 gaskets?

    Nylon.

    Why replace needle and seat gaskets?

    Worn or hardened gaskets are a common source of external fuel leaks around the needle and seat fitting; replacing them during a rebuild restores the seal.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

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    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy
    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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