Vinyl Wall Fitting Face Plate with Internal Thread This is the 4-hole old style faceplate used on the Hayward SP1411 Vinyl Liner inlet fitting It has 1.5" female threads on the inside, where the eyeball screws in. Material is white ABS plastic It is round with 4 evenly spaced holes on the face; the back is completely flat, with 2 partial holes The 4 screw holes are 1/4" and have countersinks that are 15/32" diameter. Distance between holes on opposite sides is 2-7/16" - from centerline to centerline Dimensions : Outside Diameter: 3-9/16" Inside Diameter: 1-3/4" Thickness: 9/32"