Description

The Mosmatic 81.426 (TYR-2f) is the compact, 6-inch version of the TYR fixed-arm series. It is specifically engineered for cleaning narrow vertical ducts, pipes, and vents where a standard surface cleaner or larger duct cleaner cannot fit.

Key Specifications

• Part Number: 81.426

• Diameter: 6 inches (150mm)

• Pressure Rating: 4,000 PSI (Rated) / 4,500 PSI (Maximum)

• Temperature: Up to 250°F

• Inlet: 3/8″ NPTF (Female)

• Outlets: 2 x 1/8″ NPTF (Requires two nozzles, sold separately)

• Material: High-grade Polished Stainless Steel

Core Features

• Ultra-Compact Profile: At only 6 inches in diameter, this unit is designed to enter tight spaces such as specialized restaurant exhaust vents, small diameter trash chutes, and industrial piping.

• Fixed Arm (2f) Precision: The arms are welded into a fixed position to ensure a consistent spray angle. This provides maximum impact against the vertical walls of the duct as the unit is lowered or raised.

• Swiss-Engineered Swivel: Equipped with Mosmatic’s reinforced, self-lubricating swivel. It features high-tech carbide seals designed for high RPMs and extreme temperatures, making it suitable for steam cleaning applications.

• Impact Protection: Even at this small size, the unit features a stainless steel cage that protects the rotating spray arms from hitting the duct walls, which prevents mechanical failure and ensures a smooth rotation.

Common Applications

• Small Diameter Vents: Ideal for 6″ to 10″ vertical exhaust pipes.

• Kitchen Hood “Duct-Drops”: Cleaning the vertical portion of kitchen ventilation systems.

• Chemical Tanks: Cleaning the interiors of small industrial vats or totes.

• Conduits: Removing debris from vertical utility shafts or small diameter drainage pipes.

Nozzle Selection Guide

To operate correctly, you must install two 1/8″ MEG nozzles. Because the arms are fixed, the “propulsion” and cleaning power depend entirely on the nozzle size.

Calculation Tip: If your pressure washer produces 4 GPM, you should use two #2.0 orifice nozzles (4 GPM ÷ 2 = 2.0 per nozzle). Using nozzles that are too small can cause the pressure washer’s unloader to bypass, while nozzles that are too large will result in a loss of impact pressure.