Groco BB Series Backing Block

Groco's BB-Series Backing Blocks improve the installation of a flanged seacock by creating a more secure connection through press Insert Threads and a flexible design that conforms to minor hull curvature.

Features:

• Flanged seacock installation is improved with the use of a backing block between the valve flange and the hull
• Includes insert threads that press into the hull side of each block
• 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

4.29" (BB-1) Specifications:

• Fits Seacock Sizes: 750 and 1000
• Insert Threads: 5/16"-18
• Diameter: 4.29"

5.38" (BB-2) Specifications:

• Fits Seacock Sizes: 1250 and 1500
• Insert Threads: 5/16"-18
• Diameter: 5.38"

7.13" (BB-3) Specifications:

• Fits Seacock Sizes: 2000 and 2500
• Insert Threads: 3/8"-16
• Diameter: 7.13"

9.5" (BB-4) Specifications:

• Fits Seacock Size: 3000
• Insert Threads: 3/8"-16
• Diameter: 9.5"

Notes: Seacock sold separately. Backing block includes brass inserts; stainless steel bolts are recommended.