We ordered the 19mm size for my wife so as to have an additional set to go with our maymom brand shields. This brand (Nene supply) turned out to be smaller, even though the size was spec’d the same as maymom. The seller actually reached out and asked me if everything was ok with them and I explained the size issue. Seller (BBXpress) said they would ship the 21mm size to us at no cost. Those turned out to fit better than the 19mm maymoms so we have retired the maymoms and now have 2 sets of the 21mm nenesupply This seller displayed great customer service, and the shields themselves work great. If you are between sizes with other brands give these a shot. FYI the valve inlet is a little larger than the other brands, so these valves won’t seal properly on the other brands’ shields, but the other brand valves work on these (tightly). Not a concern if using only these, as we are.
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