The GROCO IBVF NPS-to-NPT Flange Adapter provides a reliable marinegrade transition between standard NPS thruhulls and NPT inline valves used as seacocks. Designed for marine plumbing and OEM installations, the IBVF adapter eliminates dangerous thread mismatches, creates a sturdy mounting base for valves, and simplifies future valve replacement and maintenance.

Key Features

• Marinegrade material: C83600 bronze construction (316 stainless available) for longterm corrosion resistance in saltwater environments.
• Compatibility: Accepts standard thruhulls and mates with GROCO IBV series inline valves for secure seacock assemblies.
• Safety & fit: Eliminates thread mismatch and reduces risk of valve damage during engine or generator installation.
• Serviceability: Simplifies maintenance and future valve replacementOEMfriendly design that allows valve installation later.

Boatbuilders, yards and marine technicians choose GROCO adapters to simplify installations and ensure a leakresistant, serviceable connection. The IBVF adapter is suitable for saltwater use and pairs with standard marine plumbing fittings; bonding attachment is compatible when used with GROCO inline valves. GROCOs proven design reduces installation time and downtime for repair or replacement.

Available sizes include 3/4″ (750), 1″ (1000), 11/4″ (1250) and 11/2″ (1500). Packaged dimensions for the 1″ bronze model are approximately 5 5 5 inches with a packaged weight of about 1.2 lb; larger sizes have slightly larger packaging and weightssee variant details for sizespecific packaged dimensions and estimated shipping weights.