It is a new-type PVC multi-orifice sleeve design and developed according to the development of communication tunnel. It takes PVC as main materials. Equipped with different moulding head and stock mold, it can produce all kinds of PVC multi-orifice sleeve. The products are featured by its high compressive strength, lightness, long service life and easy construction, etc. Because sleeve and arm is integrated, it can be completed at one time. Now our products include four-orifice, five- orifice, six-orifice and all kinds of square pipes which can meet different requirements.