COUPLER 4IN BLACK INTERNAL Plugs this hardwired ionization smoke alarm

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

The chrome finish helps provide protection against chipping and flaking

durable construction delivers high endurance while its comfortable grip offers an optimized user experience

Helps protect against a forced entry

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

COUPLER 4IN BLACK INTERNAL Plugs this hardwired ionization smoke alarmInternal 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".