This Rectangular Underwater Observation Window has glazing that can be either a glass laminate consisting of three plies of 3/8" thick tempered glass in accordance with ANSI specification Z-97.1, ASTM C-1036-85 and C-1048-85, and 16 CFR 1201 Category II, with interfaces of polyvinyl Butyral .080" thick or a single thickness of 1-1/4" plexiglass. Frame is constructed entirely of stainless steel. Call for Pricing and More information.