Below-deck control module box 4" x 4 3/8" x 2 3/16" deep with water resistant faucet sensor cable connection, mixed water elbow fitting and integral strainer, 1/2" NPSM female swivel coupling nut and AC or DC operated with (4) AA batteries. Certified to ASME A112.18.1/CSA B125.1, NSF 61-Section 9, NSF 372 and UL 1951.