Jeff is a great guy. He makes quality stuff. It's a bit pricey, and international shipping is also. Jeff will mail from US POs if he's in the States for business.
I have several DivAir diaphragms and a set of Healthways blue hoses he made for me. I use the hoses on a Scuba, not my DivAirs, since the spiral shape matches the Healthways hoses, but are not very close to the DivAir hoses
I am down to 2 DivAirs from 3: one is alloy and the other black plastic. My plastic one has the original gray hoses, and the alloy one has black EPDM hoses that are a very close match in shape, but not color.