[A twin drain].
A design for drainage is suggested consisting of connected tubes with openings. For continuous and long-term drainage the openings are made one opposite to the other on the contiguous sides of the tubes.
Bondarchuk
O I
OI
Kadoshchuk
T A
TA
D004322:Drainage / Q000295:instrumentation*; D004867:Equipment Design; D006801:Humans
Sparennyĭ drenazh.