1. Application of product:
Vertical lifting manhole is installed on the lower part of the tank for easy access to convenient cover hole; safety, increase the connecting rod between the manhole and cover, ensure the tank safety, control pressure: +200 mm =-45 mm water column, indicate the product name, model order, drawing number; ordering unit can be supplied with standard HG/T 21514 ~ 21535-2005 and non-standard manholes drawing processing production.

2. Specifications of product: