WAC Lighting - WS-W48625-BK - 25" Chamber Outdoor Wall Sconce 3000K Black Solenoid_12V and the non-strippable drive mechanism

and the non-strippable drive mechanism helps protect the internal gears

The Model 17 contains an integral backflow protection device which protects up to 125 psi of backpressure and therefore does not require an add-on vacuum breaker

Is a coupling needed

Is RD900-INT-R the indoor model

WAC Lighting - WS-W48625-BK - 25" Chamber Outdoor Wall Sconce 3000K Black Solenoid_12V and the non-strippable drive mechanismBold Mid Century Modern look with intersecting aluminum frames and cutting edge LED light. Features Delivered Lumens: 605lm Color Temp: 3000K CRI: 90 Power: 12W, 18W, 22W Input: 120 VAC, 277 VAC, 50 60Hz ELV Dimming: 100 10% Rated Life: 50000 Hours Construction: Aluminum hardware with etched glass lens Minimal mounting hardware for easy installation Light engine is factory sealed for maximum protection from the elements Weather resistant powder coated