back-pressure valve

space

U+0020

hyphen-minus

U+002D

latin small letter a

U+0061

latin small letter b

U+0062

latin small letter c

U+0063

latin small letter e

U+0065

latin small letter k

U+006B

latin small letter l

U+006C

latin small letter p

U+0070

latin small letter r

U+0072

latin small letter s

U+0073

latin small letter u

U+0075

latin small letter v

U+0076