one or more pressure switches 44 in the illustrated embodiment valve 24 comprises a deluge valve which includes a priming chamber 46 as is known in the art trim manifold assembly 22 controls the pressure in priming chamber 46 and communicates with valve 24 and fire suppressant supply 26 through conduits 48 50 respectively conduits 48 50 by way of non limiting example may be flex hoses trim manifold assembly 22 also communicates with a control panel 52 via wiring indicated by dotted lines in fig1 which provides actuating signals to or monitors signals from components within trim manifold assembly 22 and also components located exteriorly of trim manifold assembly 22 to control the opening of valve 24 in response to low pressure signals from pressure switch 44 and in response to fire condition signals from detector 54 detector 54 by way of non limiting example may be a heat detector or alternatively a smoke detector referring to fig2 12 details of trim manifold assembly 22 are shown trim manifold assembly 22 may include a solid one piece manifold 60 with a plurality of fluid passages therein to allow trim manifold assembly 22 to control the operation of valve 24 as described below manifold 60 may be metal and the passages therein may be formed by machining the passages into a solid manifold block manifold 60 may have a top surface 55 a front surface 56 a.