What is the difference between the backflow prevention membrane A (DUR401) and B (DUR402)?
The diameter of the entry hole when covered on the receiver is different.
Please select the AB size by referring to the figure below.
One piece of each is included in the package for trial use when you purchase the main unit.
■Product details
Men’s wearable urine collector for sleeping position AS-DUR010
https://asahi-packaging.com/products/dandy-urinar/
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