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These simple sight gauge kits have been designed so they can be easily dismantled and cleaned. The sight "glass" itself is not made from glass, it's made from robust polycarbonate. The two peice set include the stainless ½" BSP threaded post with o-rings and a 60cm long polycarbonate tube (13mm ID x 15mm OD) that you can cut down to size to suit the vessel that you are using. Due to the simple design the tube can easily be pulled out of the post which makes for very easy cleaning. If you want to permanently connect the sight gauge to the post you can use a stepless clamp to fix the polycarbonate tube to the post.