These products are totally interchangeable with the actual Spectra parts for my S2. When it arrived, one of the valves was torn, but I contacted the seller who sent a replacement pack right away. My original Spectra valves are getting worn out now (they don't stay shut tight when not in use) so I'm about to order some more. I actually prefer the Nenesupply valves as they are easier to get off the flanges when wet.
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