Silicone T-hose heater Ø28/18/28 mm Mercedes Citaro Euro 6 OEM A0029977374 — REDOX

REDOX silicone T-hose for the cabin heater circuit on Mercedes-Benz Citaro Euro 6 buses (3rd generation, launched late 2012, OM 936 on the 12 m version and OM 470 on the 18 m articulated). Direct replacement of OEM Mercedes-Benz A0029977374.

Asymmetric T geometry

• Main Ø28 mm (manifold inlet)
• Aligned Ø28 mm outlet (line continuation, same diameter)
• T branch Ø18 mm (heater core feed)

This Ø28/18/28 mm variant differs from sister reference A0029977074 (Ø28/18/18 mm) by keeping the Ø28 on the main outlet — used upstream in the circuit before the reduction to Ø18 downstream. Verify actual diameters on the vehicle before ordering.

Technical construction

• 4-ply VMQ silicone, REDOX reinforced formulation for public-transport use
• Polyester woven reinforcement
• 5 mm wall
• -60/+180 °C continuous
• 65-75 Shore A hardness
• Compatible with all Mercedes-Benz glycol coolants

Benefits vs OEM

A Citaro typically runs 60,000-100,000 km/year in urban duty with frequent cold starts. OEM rubber degrades faster than on a passenger car. REDOX 4-ply VMQ offers outstanding long-term thermal stability, shape memory, ozone/UV resistance — longer service life, less downtime.

Delivery

Hose supplied alone. W4 stainless clamps in 28 mm (×2) and 18 mm recommended. Plug-and-play replacement of A0029977374.