what are the proper dimensions/sizes for the rubber gaskets and o-rings?

The rubber gasket is for the older design fittings and is available from Amazon: Nelson 50339 Hose Quick Connector Washer Set. The newer design uses an o-ring for the seal along with a regular hose washer. A good replacement o-ring is a 70 durometer Buna-N with 16mm ID x 20mm OD. I bought 10 off eBay for $3.89 and they work much better than the original. Use a little silicone grease at first. My original o-rings lasted a week ... these replacements were used daily all summer and are still OK.

Are either the male or female ends compatible with the old 109C model?

The male half is dimensionally the same for the new and old part. The only difference I can see is the knurled section is smaller on the new male halves.I used a new female end with an old male end this winter. It worked for a while but the o-ring failed and it didn't just drip, it was a mess.

When disconnected, does the female half shut off flow?

No. These are not flow-control devices, only connectors. The pressure needs to be shut off first... I don't think it will disconnect if pressure exists.FWIW, after getting used to these connectors I am never going back to using the thread-on thread-off attachments.

Do male or female sides rotate independently for easy connect?

Yes they do! Best quick disconnect that I have found! Tighten each side to your hose or hose bib and snap them together. Fantastic!

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