There is a third connection on the motor

M4100P12 — Watertight Male Plug is made of yellow super tough nylon and has gasketed locking ring to make plug/receptacle interface watertight

Available in red and  blue

its unique shape allows it to be compressed by hand or cut to fit

INCLUDES a click latch lid

TH Marine - Washdown Fittings, Part No. WDV-1-DP - Straight With Shut-off Valve Black Scot Pump There is a third connectionThis injection molded plastic fitting is 2 1 4" in diameter and mounts in 1 1 4" diameter hole with 3 countersunk screws. Barbed hose fitting connects 3 4" inside diameter tubing. Standard hose threads with a protective cap which has a retaining strap is standard.