also: ポンプ
noun
The kanji spelling 喞筒 is an archaic ateji form; the modern word is ポンプ. The reading そくとう (and variant しょくとう) are historical Sino-Japanese readings of these characters, not used in contemporary language.
See also: ポンプ
「喞筒」は、昔の文献でポンプを指す当て字として見られることがある。
The characters 喞筒 can be found in old documents as ateji for 'pump'.
This is the standard modern word for 'pump'. 喞筒 is an obsolete ateji spelling that should not be used in contemporary Japanese.
The kanji 喞筒 are ateji (characters used for their phonetic value) representing the word 'pump'. The readings そくとう and しょくとう are Sino-Japanese readings of these characters, but the word itself is a loan from a European language (likely Dutch 'pomp' or English 'pump'), now standardly written in katakana as ポンプ.