DUCO® High Temperature Gauge Glass PTFE Gasket (2-pk) for 5/8″ OD Sight Gauge Glass (for Steam Boilers, Jewelry Steamers, Return Tanks and Reservoirs)* Stop replacing ordinary Black Rubber glass gaskets every 1-3 months!* This PTFE Hi-Temp Gasket won’t crush, leak or dry out !!Made of High-quality PTFE material Outstanding high-temperature resistance up to 392 ºF (=200 ºC)Extremely long service life against high-pressure and steam temperaturesDesigned for Steam Boilers, Jewelry Steamers, Return Tanks and ReservoirsFits to 5/8″ OD tubular sight glasses of all Brands Steam Boilers, Jewelry Steamers, Return Tanks and ReservoirsSight Glasses are not included. * Buy 2 or more to get extra discount up to 20% off * This listing Includes: 2 pcs of PTFE GasketSpecifications:Material: Premium PTFE (holds up to 392 ºF, 200 ºC) I D: 5/8″ (15.88 mm)OD: 27/32″ (22.0 mm)TH: 5/16″ (8.0 mm)Shipping: Free, Fast & Same Day Shipping Same Business Day Shipping for the orders paid by 12:00 pm EST (Monday-Friday).All orders paid after 12:00 pm EST will be shipped on next business day. Returns:We accept buyers’ return within 30 days after receiving the item, buyers pay return shipping. Questions?Please contact us if you have any questions and suggestions. * Visit our store for sight glasses *PARTS EXPRESS