We offer sight windows with different connection styles. Circular sight windows offered in bolt-on, C-Clamp and weld on connections. Obround sight windows are weld in place style sight windows. Choose the model KB for weld pad style or a model KB-FT for an ANSI threaded flange mount. Select a model KB-RF to mount the sight window an existing ANSI flange or pad. The model KB-WN offers a weld neck style mount. The model SSTC is a sanitary sight glass using a C-Clamp style design.