Standard 2 x ½” inlet x direct mount (54mm centres) with 2 x 1/4” vent port. This slim, compact valve incorporates all the standard long service life features of the standard N series needle valve, multi-ring piston style packings, back sealing facility. Includes a safe anti-rotational cam locking device and mounting holes supplied as standard for wall or bracket mounting. Process and instrument sides are both on 54mm centres to correspond with transmitter connections. Gas version also available as 2 x isolate, 2 x equalise, 1 x vent.