I just replaced the flimsy EPDM hoses on my Mark 15.5 with the same hoses used on Boris, ordered direct from Herbert Cooper. Expensive, yes, but what an upgrade!!

In today's 200 minute dive, I noticed reduced work of breathing (metal reinforcement prevents collapse), MUCH less condensation (insulated), and best of all, the comfort in knowing that an accidental brush with a sharp object won't flood my loop (heavy duty fabric).

FYI, Herbert Cooper Company is definitely old school, which makes sense considering the part of the country they are in. I doubt if there are many traffic lights in Genesee, PA. Once out of the three times that I called, I spoke to a Mr. Cooper himself. It sounded like they wouldn't be putting up a web site any time soon. They would not take my order over the phone (I had to fax them a written purchase order) and they delivered them via UPS C.O.D. almost two weeks later. Well worth it.

I would think that the same length would work for the KISS, etc, as long as the ends could be adapted.