on page 3 of JMJ's mindblowing studio the Knas Ekdahl Moisturizer can be seen on top of the Moog Modular on the left

Used on the guitar and vocals for the Take Me to Church EP, as stated by mix engineer Rob Kirwan in this March 2015 Sound on Sound interview. An image of the settings can be found here.

A few items caught Hozier’s attention in particular, said Kirwan. One was the latter’s “Eastwood Airline guitar, which I bought after working on the PJ Harvey album [Let England Shake], because so many bands play run–of–the–mill guitars. Andrew loved it, and it played a very prominent role on the album. It was sent through a [Electro–Harmonix] Memory Man pedal, with the gain turned up loudly, a ProCo Rat guitar pedal for that distorted guitar sound, and one of these new hand-wired Vox AC15 amps, and then a Knas Ekdahl Moisturizer spring reverb. This was the guitar chain and it gave a really interesting tone that suited Andrew’s music. I also used the Ekdahl reverb extensively on his vocals, as well as my Neumann CMV563 microphone with an M7 capsule and Martech MSS10 preamp. This signal chain distorted in a nice way, and Andrew adored that sound. He can sing really loud sometimes, which meant that we got a distortion similar to that from the 1950s and ’60s.

“And finally, a lot of people, including artists, have been asking me for the nature of the reverb on Andrew’s vocals. It’s a combination of my Knas Moisturizer that I already mentioned, and the Altiverb [plug–in]. I used a Wendy Carlos EMT plate [preset], from which I removed all the top end, and to which I added a pre–delay.”

(...) Vocals: Bomb Factory 1176, Focusrite Red EQ, SoundToys Echo Boy, Line 6 Echo Farm, Knas Ekdahl Moisturizer, Waves Renaissance Compressor, Avid Trim & Audio Ease Altiverb.

“The two ‘tele’ voices at the top are backing vocals. I think they were ‘oohs’ and ‘aahs’ that came from the demo. They don’t sound like telephone voices at all, so I’m not sure why they’re called that. Instead they almost sound like church voices. Below are two aux tracks for those vocals, with Bomb Factory compression, Focusrite EQ and an Echo Boy delay. The backing vocals below that — ‘BV1–4’ — are the ones with the signature Leslie effect on them, and they again have some Focusrite EQ and Bomb Factory compression, and I gave them some Echo Farm slap delay to add depth to the reverb.

“The next tracks are the verse lead vocals from his Logic session, called ‘Male Creamy Lead Vocals’, on which I put some Renaissance compression and a Trim, and ‘Vox Verb’ is the Moisturizer track, plus two Trim plug–ins, one being +1dB and the other –0.5dB. I hate automating in Pro Tools, so I will often use the Trim to bypass it. Writing automation is a tedious task. Below this are the chorus vocals, called ‘New Vocal’, so we obviously recorded these again at my studio. In order to make them sound like the demo vocal I stuck them through the same chain and EQ’d them heavily. ‘Vox Plate’ is the Altiverb, and there’s a delay track below it which again has the Echo Farm, on a delay setting. Finally there are several more double–tracked chorus vocals, and they also have the Renaissance and Focusrite, and the Moisturizer and Echo Farm aux tracks below them.”

Jack mentions that he has it when listing his equipment:

I have...a [Ekdahl] Moisturizer [spring reverb]

In the comments someone asked what reverb he uses. He replies by stating "it's a spring reverb by Knas!"

in the first page of this instagram post, the Knas Ekdahl Moisturizer can be seen in the background by Ryuichi

at 5:15 in the video the Knas Ekdahl Moisturizer can be seen

"The Ekdahl Moisturizer reverb is really cool. The springs are exposed, so you can play with them and make some crazy noises. I love how the Death By Audio Ghost Delay lets you layer echoes. If you want a Boss style digital delay, you’re not going to be satisfied with it, but it can get crazy and inspiring if you’re open to it."

A user-uploaded photo shows Ira Kaplan using the Knas Ekdahl Moisturizer, positioned over his Ace Tone amplifier.

Visible in this August 12, 2017 Instagram post.

In an Instagram post by Fontaines D.C., the Knas Ekdahl Moisturizer is visibly placed on top of Carlos O'Connell’s Mellotron M4000D, thereby confirming that the artist uses this specific piece of gear.

In an Instagram post, Aaron Turner shows the Knas Ekdahl Moisturizer as part of his setup while preparing for Thalassa shows and solo recordings.

per this April 5, 2018 feature for Future Music a photo from Avery's studio reveals a Knas Ekdahl Moisturizer spring reverb.