COUPLER 4IN BLACK INTERNAL Plugs Accepts two strips of nails

Accepts two strips of nails

DURABLE: Designed for all users from homeowners to DIY enthusiasts to professionals

The chrome finish helps provide protection against chipping and flaking

The open-back blade fits the premium 48-inch North American hardwood handle for strength

this hardwired ionization smoke alarm can also integrate with up to 12 other First Alert or BRK hardwired alarms for coverage of larger spaces

COUPLER 4IN BLACK INTERNAL Plugs Accepts two strips of nailsInternal coupler. Made with high density polyethylene resin. Lightweight and flexible. For residential and commercial construction. Can be used for interior and exterior foundation drains, downspout run off drains, low spot drainage plus driveway and sidewalk underdrainage. Heavy duty fittings. Snap together coupling. Size 4".