Gaggia O-ring 421940213841 – Silicone PTFE/FDA Brew Group Seal, 3.8mm ID x 1.8mm

Silicone Brew Circuit Seal for Automatic Espresso Machines

The Gaggia O-ring 421940213841 is a food-grade silicone seal with a PTFE surface treatment for brew group and water circuit joints on compatible automatic espresso machines. It measures 3.8 mm inside diameter, 7.2 mm outside diameter and 1.8 mm cord thickness. The part also appears as OR 2015 in the manufacturer catalogue and as Philips 996530013564 in cross-reference lists.

The silicone compound meets FDA food-contact requirements. PTFE treatment on the surface lowers friction during insertion and resists coffee oil adhesion. Silicone holds elasticity across the brew temperature range and returns to shape after compression cycles. The material tolerates hot water, mild descaling agents and the cleaning programmes used on automatic machines.

Fit the seal to the brew group outlet nozzle, cream valve support or pressure hose joint as required by the machine model. A hardened or flattened ring allows water to bypass the joint, which drops brew pressure and produces weak crema. Replacement restores the hydraulic seal without disturbing the pump or boiler. The ring seats by hand and needs no tools or lubricant beyond a food-grade silicone grease film.

Inspect the seal at each descaling interval. Heat cycling and cleaning agents harden silicone over time, and a compressed ring loses its rebound. Replace the ring whenever the joint weeps or the brew group loses pressure. A red colour identifies the part during service, and the 1.8 mm cord covers moulded tolerance on plastic and metal fittings. Stock the seal as a consumable for Gaggia, Saeco and Philips automatic machines.

Key Features

• FDA-Grade Silicone Compound
  The base material meets food-contact standards for parts exposed to drinking water and coffee.

• PTFE Surface Treatment
  The low-friction surface eases installation and limits coffee oil build-up on the ring.

• 3.8 mm Inner Diameter
  The bore fits the brew circuit spigot with a close interference seal.

• 1.8 mm Cord Thickness

  • Compensates for moulded tolerance on plastic and metal fittings
  • Maintains sealing force through repeated brew cycles
  • Resists compression set better than thin-wall seals

• 7.2 mm Outer Diameter
  The outside dimension seats cleanly in the machined groove on the brew unit.

• Multi-Point Application
  The seal suits brew group outlet nozzles, cream valve supports and pressure hose joints.

• Cross-Reference Compatibility
  The part matches Saeco, Philips and Gaggia catalogues under the listed alternative codes.

Specifications

What’s in the Box

• One 421940213841 silicone PTFE O-ring

Why Choose This Brew Circuit Gasket

• The food-grade silicone ring restores the seal at brew group and water circuit joints.

• PTFE treatment reduces friction and resists coffee oil adhesion on the surface.

• A 1.8 mm cord thickness covers tolerance on moulded and machined fittings.

• The 3.8 mm bore matches common brew circuit spigots across the model range.

• Replacing the joint seal removes the leak that causes slow flow and weak crema.

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