For high performance aircraft these pitot static ports are available in either a surface mount of flush mount configuration. Made of 6061-T6 aluminum both feature 7 port vent holes, with an outside diameter of 1-3/4″, and a 1/8″ NPT fitting with hex wrenching flats. The surface mount version fits into a 5/8″ diameter hole. The flat mount version fits into a 1/2″ diameter hole in .032 thick skins from behind. P-5I series has 6 ea 3/32 or #40 size rivet holes, the P-40 series has 4 ea 3/32 or #40 size rivet holes and 1 port vent hole.