SYI can supply Ductile Iron Manhole Covers with Concrete Seating according to AS3996 standard, with airtightness and watertightness.
Features:
Material:500-7
Standard:AS3996 Class B
The machining contact surface between cover and frame with function of anti-rocking and anti-movement,completely solves the potential risks of aging and frenquent replacement of rubber ring.
Grease between cover and frame forms the good effects of water/airtightness,which meets the requirements of AS3996 standard 4.2.3 gas seal and 4.2.4 water seal.
Precasted concrete makes the installation of manhole cover more convenient.
