Luneta’s new Sight Glass has all the clarity and durability you need, with none of the leaks, cracks or squinting you may be used to with those old-style sight glasses. It is durable, convenient, and precise. -Resistant to chemical wear and build up -Integrated threads so there is no leaking between the sightglass and machine port -The Sight Glass extends from the machine, providing a clear view of oil Constructed of Tritan TM, it is the toughest Sight Glass available. Available at $33.29.