The Valterra T05-0784 Female Floor Flange is an RV replacement toilet seal designed for a 3" male pipe thread and a 4" diameter opening.• Hole cutouts are pre-drilled• Made from ABS plastic• Thread Size: 3" FPT• Usable Threads: 0.541" female Hole cutouts are pre-drilled Made from ABS plastic | Valterra T05-0784 Female Threaded Toilet Floor Flange, 4" x 3" | ABS Plastic