This Appraisal is for a range of ductile iron access covers and frames for utilisation in sewer systems. The range includes Maestro DN 600 Class E solid top hinged, TP800 DN 600 Class B solid top bolt down and TP800 DN 600 Class D solid top bolt down.
This Issue 3a is to include TP800 Class B and Class D access covers and correct a typographical error.
The Maestro solid top access covers incorporate a ductile iron hinge system (captive or non-captive) with the cover secured to the frame by three flexible ductile iron locking bars (slam lock). The provision of an elastomeric seal located between the cover and frame provides a water and gas tight seal and also serves as an anti-rocking feature.
The TP800 solid top access covers utilise three bolts and an O-ring polychloroprene seal to secure the cover to the frame.
The covers all have a skid resistant raised pattern.
The keyholes provided on the covers comply with AS 3996 and are compatible with the industry standard key lifter.