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drive pipe
drive pipe n.
Brit. 
/ˈdrʌɪv pʌɪp/
, /ˈdrʌɪv pʌɪp/U.S. /ˈdraɪv ˌpaɪp/
a pipe conveying water for driving a hydraulic ram or other apparatus./ˈdraɪv ˌpaɪp/ΚΠ
1851 W. Fields U.S. Patent 7,918 1/1 The hinge-valve C opening upwardly and inwardly, at or near the upper end of the inclined-plane or drive-pipe C, D, of the hydraulic-ram.
1954 R. H. Cochrane Farm Machinery & Tractors (ed. 2) 95 Water flows from the source of supply down a drive pipe and through a pulse valve.
2008 A. M. Michael et al. Water Wells & Pumps xiii. 607 Longer drive pipes do not increase the efficiency of the ram substantially, but permit the pump to operate at less strokes per minute.
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