T-type filter looks like the letter "t" shape, so we call it T-type filter.

Product Detail
Design standard: ASME B16.34
Length of structure: ASME B16.10
Flange connecting end: ASME B16.5
Wall thickness: ASME B16.34 
Inspection and test: API 598 
Pressure and temperature rating: ASME B16.34 
Product scope: NPS 2 Inch - NPS 24 Inch, Class 150 - 300 LB 
Main body material: ASTM A216 WCB, ASTM A352 LCB, ASTM A216 WCC, ASTM A217 WC6, ASTM A217 WC9, ASTM A351 CF8, ASTM A351 CF8M, ASTM A351 CF3, ASTM A351 CF3M, ASTM A890 4A, etc.