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Groco BB Backing Block For Flanged Seacock 

# 462-34-BB1
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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
  • 1/2" thickness is rigid enough for a secure installation but flexible enough to conform to minor hull curvature
  • Will not swell or absorb moisture

Size: 4.29" Dia., Fits: 3/4" & 1" Seacocks, Bolt: 5/16" - 18"
MSRP: $65.00
Your Price: $52.99
 You Save: 18% off MSRP!

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