Kichler - 16258CBR30 - C-Series 20W 60 Degree 3000K In-Ground WYF078277398225 giving you an immediate point

giving you an immediate point of connection for hoses and other equipment

Which outdoor unit should be used

Viton seals

The Corona Tools AC7400 is a 15 in

The title identifies it as a 3-1/2 in

Kichler - 16258CBR30 - C-Series 20W 60 Degree 3000K In-Ground WYF078277398225 giving you an immediate pointSpec Sheet Install Manual This durable 60 degree 1625LM 3000K In Ground well light features the ability to adjust the direction of the light from outside the fixture leaving the factory seal intact. Featuring a cast brass housing that sits within a heavy duty polymetric sleeve, it also offers silicone rubber gaskets at the lens, a potted driver, and a strain relief below, all designed to prevent water ingression. Finish is Centennial Brass; Stainless