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Forespar Marelon Full-Flow Seacock with Mushroom Through-Hull

Forespar Marelon Full-Flow Seacock with Mushroom Through-Hull

  • Includes Thru-Hull, Seacock with Integrated Straight Hose Barb
  • Material: Glass Reinforced Nylon Composite, ABYC H-27 Compliant
  • Compact Footprint, No Corrosion or Electrolysis, Select Hose Barb
  • Item #: 
    Model #: 
    Multiple Sizes Available
    Our Price:
    From: $95.99  To: $211.99
    95.99 211.99
    Please enter quantity below.
    Hose Barb
    Model #
    Shipping Weight
    1/2 Inch
      0.50 Lbs.
      *In Stock!*
    Our Price: $95.99
    3/4 Inch
      0.65 Lbs.
      *In Stock!*
    Our Price: $99.99
    1 Inch
      1.00 Lbs.
      *In Stock!*
    Our Price: $118.99
    1-1/4 Inch
      1.20 Lbs.
      *In Stock!*
    Our Price: $143.99
    1-1/2 Inch
      1.40 Lbs.
      *In Stock!*
    Our Price: $152.99
    2 Inch
      1.60 Lbs.
      *In Stock!*
    Our Price: $211.99
    Click the "More Info" button above for specific information about that product.

    Package Includes:

    • Full Flow Seacock with Integrated Hose Connector
    • Hose Barb: Straight
    • Mushroom Thru Hull
    • Emergency Handle
    • Cap / Thru-Hull Plug


    • Forespar Marelon Full-Flow Seacock Mushroom Thru-Hull
    • This integrated 2-part system comes complete with a Marelon® valve and properly matched mushroom head thru-hull with super strong "buttress" type threading
    • This package is designed to eliminate valve and thru-hull thread style mismatches
    • Exceeds ABYC-H-27 Standards
    • UL Approved for use above or below waterline
    • Never corrodes
    • Exclusive polymer formulation

    Click Here for a Brochure with Dimensional Drawings for this Product

    General Note: Forespar threaded plumbing fittings (like most true marine plumbing fittings) use NPSM Threads - National Standard Free-Fitting Straight Mechanical Pipe Thread. NPT - National Pipe Threads are tapered, NPSM Threads are parallel. The two types are not designed to work together.

    WARNING: This product MAY expose you to chemicals, which are known to the State of California to cause cancer, birth defects and/or other reproductive harm. For more information go to

    Trident 250/100 Flex Marine Wet Exhaust and Water Hose - 1/2 Inch
    Item #: 302026HID012
  • Diameter: 1/2" ID, Color: Black
  • Material: Hi Temp EPDM Rubber, Wire Reinforced, Tolerance: 280° F
  • Excellent Flexibility and Bend Radius, Sold by the Foot
    Model #:
    BoatLIFE LifeSeal Marine Sealant
    Item #: 753982
  • Select Color, Permanent, Watertight, Flexible Seal for Joints
  • Formulated for Fiberglass, Glass, Wood and Bedding Marine Hardware
  • Container Size: 2.8 Ounce Tube
    Model #:
    Multiple Models Available

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