De Dietrich 89705505 set: gasket 3/8" + retainer ring

The De Dietrich set, part number 89705505, includes a 9 mm gasket and a locking circlip designed to seal the boiler tank flange (models MLS 150–250) . The gasket is made of high‑temperature and chemical‑resistant material, ensuring durable, leak‑proof joints in the heat exchange circuit. This kit enables fast restoration of airtightness with minimal effort and no major repairs required. Available for purchase with delivery — ideal for service technicians and installers.