this is my department, lol.
Mr Hankey's toys Solatok https://www.mrhankeystoys.com/online-st ... p131113032
15" circumference knot
I have one. i have not been able to take it yet, dont know exactly what is stopping me, but i am still looking forward to taking that huge knot. You might want to special order this thing in 40% firmness, i find that the 75% firmness is a bit too much, the toy is very short and stout, which make it very solid. an issue i find myself having is that the head will not go where i need it to go without careful effort because it is so flat and thick. combined with its the thickest object i have attempted, big headache of a toy. i dont quite know how i feel about Solatok overall, its a toy i cant fully insert and have to do a massive amount of warm up to feel comfortable enough to attempt. I like how it looks and the textures can work for me. But 15" circumference knot.
as a side note about Cassius, the inflatable aspect not only feels great, but mean you can stretch out at you own pace. the toy also just feels great to use in general, kinda like Diego, but different. Love my Cassius, but taking an inflatable knot is not the same as a solid knot. the inflatable knot compresses a lot during insertion, so i does really "feel" like your taking something as thick as it really is, one in you most definitely feel it. Great toy.