Water Pump Suction Pipe connects to the front the engine block, and is the inlet for the the cooling system.
Overview
Part Numbers
Regular 1200 uses a straight pipe.
21045-18000 PIPE-SUCTION WATER PUMP 21045-H2300 PIPE-suction, water pump GX
The GX water pump inlet pipe at front of block (PIPE-suction, water pump) has an additional hose fitting for the manifold coolant hose.
21045-18000 B120 21045-M0100 B120 7510-7907 21045-M3000 B120 7908-8910 21045-G5105 B120 8910-
Regular B210 uses a pipe with one small hose connection.
21045-M0100 A12S,A14S [one small fitting] 21045-M0800 A12T B210 [two small fittings, one straight up] 21045-H8400 A14T B210 [two small fittings]
Left: 21045-H8400. Right: 21045-M0100
21045-H8400 B310 A12S.S,K,A14-V A13,A15 S,K.A14,K.A12S 21045-H8410 B310 A14S.S,K+AT A15S S,K.A14S 21045-M0100 B310 Van <> 21045-M0110
Removal
The suction pipe is a press fit into the block. Put vice-grips on it and tap the vice-grips until the pipe comes out.