Just an FYI. VDH has silicone diaphragms in stock right now. He got them in just before the store "crashed" These are also at the new price of $20.00. I picked up a couple and they are very nice. A new duck bill can be installed with out opening the cans. Use a popsicle stick or a tongue depressor to insert it and look through the exhaust holes for proper alignment.
Jim
Jim