... ThicknessClass150~2500Flange FacingRF(raised face) ; FF(flat face); RTJ(ring type joint); TG(tongue and groove face); MFF( male and female ... , ASME, API, NACE, and MSS. Look forward to your continued business. TypeSocket Weld,Slip on,Blind,Lapped,Screwed,Weld Neck,Long ...