Hose nipple SCHAERER Spare Parts 3326841000

A hose nipple creates a tight, leak-proof joint between flexible tubing and a fixed port inside an espresso machine. The barbed ends grip the inner wall of the hose while an external thread screws into the machine body, sealing the water path against pressure and vibration. PPSU (polyphenylsulfone) is chosen for its resistance to hot water, steam and the detergents used in daily cleaning, so the connection stays dimensionally stable and chemically inert over years of service.

To fit the nipple, the operator slides the first hose over one barbed end until it bottoms out, then repeats the step on the opposite side. The threaded section is then screwed into the matching port on the machine, usually with a spanner to prevent over-tightening. Once the water supply is turned on, the joint should remain dry; any seepage indicates either an improperly seated hose or a damaged nipple that must be replaced.

The 4-4 designation refers to the nominal hose inner diameters the nipple accepts, ensuring compatibility with the standard tubing sizes used in SCHAERER espresso machines and many other professional beverage systems. No additional clamps or sealants are required when the correct hose is used.

Cleaning is limited to flushing the water line; the nipple itself has no moving parts and is not disassembled during routine maintenance. If the hose is removed, the barbs should be inspected for wear or mineral deposits and cleaned with a soft brush before re-fitting.

This part is listed in the SCHAERER spare-parts catalogue under water-system components for espresso machines.