| Image | Supplier | Item Code | Short Description |
|---|---|---|---|
| | NIBCO INC | NIB NLK652H | GD48654N 4 GRV UL/FM BFV W/O SWITCH D I |
| | NIBCO INC | NIB NLK662H | GD48658N 4 GRV UL/FM BFV W/SW DUCT IRON |
| | NIBCO INC | NIB NLK862H | GD4865C8N 4 GRV 300 BFV SIGNAL CLOSED |
| | NIBCO INC | NIB NLK962H | GD6865C8N 4 GRV 350 BFV SIGNAL CLOSED |
| Manufacturer | NIBCO INC |
| Finish | Nylon Coated |
| Nominal Size | 4 in |
