DMF Lighting M Series Round 4" New Construction Housing Rating:Fire Rated saving the pump from heat

saving the pump from heat buildup)

Without it you'll either be using a plastic fitting that will break or you'll need to put your washer on a milk crate every time you use it

whereas a larger 3" works better for going over stuff like expansion joints in your driveway

and of course

You also wouldn't spray an entire panel with this

DMF Lighting M Series Round 4" New Construction Housing Rating:Fire Rated saving the pump from heatThe DMF Lighting M Series New Construction Housings provide the foundation for your DMF Lighting experience. This frame takes out the unnecessary bulk found in other frames while providing the needed adjustability to position the fixture right where you need it. Using the notches located on the opening of the can, these fixtures can be lined up with other fixtures using string or a laser. This housing is compatible with all DMF Lighting M Series Trim