A tɔŋ de blind board ye flange, a tɔŋ de blind flange wala tube blockage. A ye flange ye tɛ̈n tɛ̈n tɛ̈n tɛ̈n tɛ̈n tɛ̈n tɛ̈n tɛ̈n tɛ̈n tɛ̈n tɛ̈n t Kä ye looi aye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈n ye tɛ̈ Sealing surface form has many kinds, with plane, convex surface, concave convex surface, grooved surface and ring connection surface. Sealing surface form has many kinds, with plane, convex surface, concave convex surface, grooved surface and ring connection surface. Sealing surface form has many kinds, with plane, convex surface, concave convex surface, grooved surface and ring connection surface.