Groco Backing Blocks for Flanged Seacocks

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Product Description

Flanged seacock installation is improved with the use of a backing block between the valve flange and the hull.


  • Each size fits multiple seacock sizes.
  • Press threaded inserts into the hull side of the backing block into the holes that match the seacock flange.
  • Rigid 1/2" thickness provides secure installation but is flexible enough to conform to minor hull curvature.
  • Will not swell or absorb moisture.


SKU: #

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