Finally a solution to the problem we all face when plumbing or wiring a project car. These two-piece bulkheads snap together firmly around your hose or wire after you have ran your hose/wire in position. No more forgetting to put your grommet on before installing your hose end or battery terminal. These bulkheads cover the over-size hole needed to pass a fitting/hose end through a firewall, and clamp on after the hose is plumbed. Providing a clean looking, and builder friendly install