Waterway Plastics discontinued all Snap-in Poly Storm Series Jets, except this one.
Light Grey "Sterling Silver" - 5-Scallop, Directional Mini Storm Jet (includes diffuser 218-4000) .
Face diameter: 3-3/8". (Also replaces 3-5/8" & 4" large face diameter Poly Storm Inserts.)
Overall length: 4-3/8".
Diameter of Tail Piece: 7/8".
Waterway initially made all Storm Jets Snap-in and these were commonly used until 2017 (to install, push in and turn a 1/4 turn clockwise to lock in place). If you have Snap-in style jet housings, you must use this Snap-in style insert (the newer threaded style inserts will not fit).