Glass Level Indicator Glass Level Indicator Supplier Tubular Level gauges are simple reliable device for direct reading in atmospheric or pressured tank application. It is mounted parallel along the side of tank, and gives local liquid indication in the transparent glass tube as the process level fluctuates. Gland packing design provides tension free tube installation to achieve zero leakage and also enables glass removal for replacement or cleaning without dismantling of tubular gauge. Auto-shut of ball check valve arrangement provided for preventing liquid loss during glass breakage.