Mark, Cecil is correct. And yes I do sell the Vertex product line. I offer conversion kits for the airstones or any other diffuser supplied with a windmill. I do not sell windmills even though I own one.I have had many conversations with Koenders concerning their product as it does have some fit some of the time. I see it used too often where it does not fit however. I do a lot of my own research and believe that if I am going to comment on a product I want first hand knowledge of it.I also have Ecologic rubber membrane diffusers and AES Great lakes airsones and several others.My current website that is being constructed has all of these comparisons on and should be up and operational "soon" I hope.How close is your electric service at present? If your looking for any specific pricing etc feel free to mail me at
[email protected] as I realize my posts are too "spam" related at times and I apologize for that.Ted
