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Check valve brass (brass, teflon valve body).
Available in several sizes:
-O (inch): 3/8 "(12 x 17 mm)
-O (inch): 1/2 "(15 x 21 mm)
-O (inch): 3/4 "(20.27 mm)
-O (inch): 1 "(26 x 34 mm)
-O (inch): 1 "1/4 (33 x 42 mm)"
-O (inch): 1' 1/2 (40 x 49 mm)