Piaggio B004741 Rubber Water Radiator Delivery Hose – Porter Petrol, LPG, Methane and Diesel D120

The original Piaggio radiator water supply hose, code B004741, is the rubber hose that carries coolant through the Porter's circuit. It is shaped with a double S-curve, with the visible textile reinforcement weave on the surface and smooth ends for clamping with standard screw clamps (observed from product photographs). On the Porter, it connects the passenger side radiator to the piping that runs under the seat: it is one of the hottest and most stressed sections of the entire system.

✓ Strengths

• Original Piaggio Group spare part, code B004741 — standard shape, not a universal hose to be forcibly bent
• Works on the entire Porter range: petrol, LPG, methane, Maxxi, and D120 diesel, from 1992 to 2015
• Textile reinforcement: resists circuit pressure and hot-cold cycles without swelling
• Pre-formed double curve: mounts without constrictions, which are the hidden cause of half of all overheating issues
• The return twin is B004742: it's advisable to change them together
• New product, shipped from an official Piaggio and Aprilia dealer

Technical specifications

Vehicle compatibility

List taken from the official Piaggio Group spare parts catalog. If your trim is not listed, send us the VIN: we will verify the exact code in the official catalog before you order.

Who it's perfect for

For those who keep a working Porter on the road and want to close the cooling circuit issue rather than chasing it. A supply hose that fails in the middle of the day, with a loaded van, is not just a loss: it's the engine overheating while you're making a delivery. Changing it along with the B004742 return hose costs little more than a coolant refill and frees you from worry for years. It's also the right part for those restoring a twenty-year-old Porter with original spare parts, rather than with a universal hose and hardware store clamps.

Frequently asked questions

How do I know if the hose needs changing?
When the engine is cold, squeeze it by hand: if it's hard and glassy, or conversely soft and spongy, it's worn out. Look for cracks on the bends and white or green halos near the clamps. ⚠️ Attention: this hose can be damaged inside even if it looks healthy outside.

What is the difference with B004742?
They are the two rubber hoses of the same circuit: this is the supply, B004742 is the return. Different shapes, not interchangeable.

Is it suitable for both petrol and diesel?
Yes. The official catalog indicates this code for Porter petrol, LPG and methane — standard and Maxxi — and for D120 diesel, standard and Maxxi.

Are clamps included?
No, the price is for the hose only. They are standard screw clamps, available everywhere.

Does the shipment originate from Italy?
Yes. We ship from Cercola, in the province of Naples, with tracked courier.