Rectangular Sight Glass Fittings. Rectangular Sight Glass Fittings For welding into or onto vessel wall 250 to 1000 mm long with 18 mm viewing width 240°C operating temperature 16 bar operating pressure Rectangular Sight Glass Fittings Explosion Proof Light Fittings for Rectangular Sight Glass ATEX approved Ex II 2G ia IIC T4/T5/T6 Stainless steel construction with LED's for a long operating life LED's improve liquid levevl observation Safe area version also available Explosion Proof Light Fittings for Rectangular Sight Glass Obround Rectangular Sight Glass Fittings For welding into or onto vessel wall, radiused base flange available 6" to 24" viewing length with 1" to 4" viewing width 500°F operating temperature 150 psi operating pressure Obround Rectangular Sight Glass Fittings D-Ended Rectangular Sight Glass Fittings For welding into or onto vessel wall, radiused base flange available 121 to 725 viewing length with 15 to 50 mm viewing width 240°C operating temperature 25 bar operating pressure D-Ended Rectangular Sight Glass Fittings Type 99.LSG Rectangular Metaglas Sight Glass Replaces rectangular toughened glass 220 to 340 mm size 300°C operating temperature 40 bar operating pressure, higher available on request Type 99.LSG Rectangular Metaglas Sight Glass