Assertion: snorkel's tube | /r/HasProperty | simple
Facets:
Source sentences:
text: The best diving snorkel should have a simple tube that doesn’t have a purge valve.
text: You can either choose a simple snorkel, which is the simple tube and mouthpiece, or you can purchase a full-face snorkel mask.
text: Don’t make the mistake of thinking that a snorkel is just a simple tube and mouth piece.