Product Information Sheet LEE BURST DISC PLUG The Lee Burst Disc Plug provides reliable, high-pressure relief in a leak-tight, corrosion resistant package. The Burst Disc Plug is designed to seal a passageway or volume until the rated burst pressure is exceeded. At that point, the burst disc in the plug ruptures, creating a flow passage as large as Ø.25" (12 Lohms*) to relieve the excess pressure or allow flow to/from the isolated system. Manufactured from Incoloy ® 825 and Inconel ® 625, the Burst Disc Plug incorporates Lee’s field-proven controlled expansion principle, which ensures retention and prevents any bypass leakage without the use of threads or elastomeric seals. Features: ■ Constructed of NACE compliant materials (Incoloy 825 & Inconel 625) for use in high-temperature and corrosive environments ■ Brazed with a precious metal alloy to provide a permanent, hermetic seal ■ Compact design • standard: Ø.531" x .68" OAL • special sizes as small as Ø.250" x .37" OAL available upon request ■ Utilizes Lee’s field-proven controlled expansion seal • permanent leak proof design • infinite shelf life – no O-ring or elastomeric seal needed • no secondary retention required ■ Each lot is burst tested and every part is leak tested ■ Compatible with liquids and gases ■ Burst pressures available: 3,000 - 15,000 psid Typical Applications: ■ Downhole Oil Tool • System isolation • Instrument protection • Chemical injection ■ Hydraulic/Pneumatic System • Overpressure protection • Backup for safety relief valve ■ Process Industry • Protect safety relief valve from corrosive media ■ Tolerance: ±10% of rated burst pressure ■ Operating pressure: up to 80% of burst pressure ■ Operating temperature: up to 450°F (232°C) ■ Burst direction**: reverse (forward direction also available upon request) ■ Individually marked for ease of identification • part number, pressure & tolerance, and burst direction ■ Custom configurations are available upon request. Contact your Lee Sales Engineer for additional information * The Lohm is a measure of flow resistance. Example: one Lohm will permit a flow of 100 GPM of water at 25 psid at 80°F. Additional information can be found at www.theleeco.com. * * Forward burst direction – toward 45° seating shoulder; Reverse burst direction – away from 45° seating shoulder. ® Incoloy and Inconel are registered trademarks of Special Metals Corporation (a Precision Castparts Corp. company) The Lee Company • 2 Pettipaug Road, PO Box 424, Westbrook, CT 06498-0424 Tel: 860-399-6281

Forward burst direction - toward 45° seating shoulder; Reverse burst direction - away from 45° seating shoulder. LEE 468 BURST DISC PLUG Forward burst direction - toward 45° seating shoulder; Reverse burst direction - away from 45° seating shoulder. LEE 343 BURST DISC PLUG ( . 45 )-.410 — Forward burst direction - toward 45° seating shoulder; Reverse burst direction - away from 45° seating shoulder. LEE 250 BURST DISC PLUG Forward burst direction - toward 45° seating shoulder; Reverse burst direction - away from 45° seating shoulder. The Lee Company • 2 Pettipaug Road, PO Box 424, Westbrook,...