High Temperature Oil Sight Glass

Price From: $275.63

Quick Overview

When radiant heat is a factor, Esco offers a High Temperature Oil Sight Glass as a solution. Offered in 1 ounce or 3 ounce vertical mount, it attaches to the drain valve of equipment and provides immediate oil inspection and ability to see and drain water contamination for high heat applications up to 450°F. See below for product details, specifications, temperature and pressure ratings and size and part number chart.

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Price From: $275.63


The High Temperature Oil Sight Glass is your answer when radiant heat from nearby equipment or unusually high operating temperatures exceed the safe use of the Legacy Oil Sight Glasses. Only available in Vertical Style, the Pyrex Glass and Teflon End Caps allow for operating and environmental temperatures up to 450° F. So even under extreme temperature conditions, you will still be able to visually monitor the oil qualities and expel water contamination. This enhanced product continues to provide the visual oil management benefits when the Tattle Tale, Bottom Sediment and Water Bowl, BS&W, Pig Tail or Bulls Eye fail to operate due to high temperatures.


  • Heavy-walled Pyrex glass
  • Teflon™ end plates
  • Stainless steel nuts & bolts
  • Viton O-rings
  • 1/4”, 3/8” or 1/2” NPT brass nipple included
  • Brass drain valve (1/4” NPT)
  • Stainless steel hardware or magnetic drain valve options available
  • See FAQs for more information

Operating Rage: 450° F at 200 PSI

Choose A Size

High Temp 1oz, 1/4" NPT 2.75" OD, 2.50" L OSG1X250HT
High Temp 1oz, 3/8" NPT 2.75" OD, 2.50" L OSG1X375HT
High Temp 1oz, 1/2" NPT 2.75" OD, 2.50" L OSG1X500HT
High Temp 3oz, 1/4" NPT 3.50" OD, 2.50" L OSG3X250HT
High Temp 3oz, 3/8" NPT 3.50" OD, 2.50" L OSG3X375HT
High Temp 3oz, 1/2" NPT 3.50" OD, 2.50" L OSG3X500HT