Question 1

Are these submersible during operation, or do they need to "float" on the water surface?

Accepted Answer

Submerged

Question 2

How important is the frequency mhz of the replacement disc?  i can't determine what my current sparoom ultrasonic diffuser has in it.

Accepted Answer

I can tell you most diffusers use a frequency like this 
When mine failed , I took whatever info on the pisio and googled it with diffuser

I found so many diffusers and this pisio was always popping up

The real issue is diameter and cross section length

It has to fit into your diffusers watertight depression or it doesn’t matter what frequency you buy

The size of this pisio fit my unit so I bought the package since it offered years of replacement pizios if it worked

It worked great and now I have many left should one fail again. It fit exactly as my original that came with unit although not the same maker.

I’m betting the size is most likely standard in the diffusers made over there

Question 3

Will this kit repair the rose petal young living diffuser?

Accepted Answer

These do look very similar. The repair kits are available here www.diffuserdoc.com/young-living-rose-inspired-diffuser-repair-kit.html

Question 4

will these work with ultransmit model 27

Accepted Answer

If I looked at the right diffuser my feeling is yes

But, as I said in other posts, it ALL DEPENDS on how your unit is designed

Is the pezio located on the bottom?
If yes, then what is the diameter (width) of the pezio in the unit vs the one you are thinking of buying ?

Most likely they are, but I have noticed when I was looking for my replacement there were two sizes I kept finding

That’s the key , the pezio must replace the old and fit snug into the opening or it leaks or doesn’t fit because it’s too big

There seems to be just two sizes floating around for these table/night stand units and you can measure your existing and check the one for sale

When you find it, your done. It will work provided it comes with pre-wired connectors as shown or you need a soldering iron and solder

ASIN	B075CHT2HY
Brand	Gikfun
Brand Name	Gikfun
Capacity	100 ml
Customer Reviews	4.2 out of 5 stars 190 Reviews
Manufacturer	Esooho
Material	Ceramic
Material Type	Ceramic
Model Number	728821646510
Number of Items	5
Recommended Uses For Product	Home, Nursery, Office, Vehicle
UPC	728821646510
Unit Count	5 Count

Gikfun Ultrasonic Mist Maker Fogger Ceramics Discs with Wire & Sealing Ring for Arduino Aroma Diffuser DIY Kits (Pack of 5pcs) EK1868