We’ve recently transitioned to the Oil Sight Glasses manufactured by PK Machine/IndustryUptime due to the quality, robustness, ease of installation.  They have a smaller profile then the competitor, as well as more economical.

"We find that oil sight glasses by PK Machine are top notch in terms of quality, and the pricing is the best in the industry. They’re the only ones we use.”

"Excellent customer service is just one of the reasons we purchase oil sight glasses by PK Machine."