JIKOH MFG., INC. warranties its OPTI-KLEAR® and OPTI-LITE ® brand sight glasses to be free from material defects or workmanship for a period of twelve months from the date of sale to the original purchaser.

For the JDG-105OL OPTI-LITE® sight glass, the LED light is an integral component of the sight glass and cannot be replaced. If the LED fails within the first 12 months to the original purchaser of the sight glass, the entire sight glass, LED light and wiring assembly will be replaced at no charge to the original purchaser.

Since JIKOH MFG., INC. has no control over the use of our sight glasses or type of fuel or additive that the sight glass may be subjected to, we cannot warranty those sight glasses that have cracked, crazed or have turned cloudy or yellow. Additives that may adversely affect our sight glasses include, but are not limited to:


It is the owner’s responsibility to adhere to good maintenance procedures to replace any component that may be adversely affected by any of the above additives or a combination thereof. Sight glasses should be inspected daily for signs of cracking and crazing.