TOPRAN Coolant Flange Blanking Plug – 503 428

Description

TOPRAN 503 428 is a replacement coolant flange sealing / blanking plug for a wide range of BMW and MINI petrol and diesel applications.

It seals the coolant-system opening and helps maintain correct cooling-system pressure. The plug is manufactured from glass-fibre reinforced plastic and comes complete with the sealing O-ring and retaining clip.

Ideal replacement for:
✔️ Cracked or brittle coolant plugs
✔️ Coolant leaks
✔️ Damaged sealing O-rings
✔️ Cooling-system repairs
✔️ Preventative replacement on higher-km vehicles

Engine Compatibility

Used across a broad range of BMW engines, including selected:

✔️ N47 / N57 diesel

✔️ B37 / B47 / B57 / M57 /M57N2 diesel
✔️ N20 / N26 petrol
✔️ N52 / N53 / N54 / N55 petrol
✔️ B38 / B48 / B58 petrol

 

Because BMW uses OE 17127799184 across many different models and engines, OE/VIN verification is recommended before ordering. Catalogue data confirms extensive BMW fitment, including 1–8 Series and X models.

Common BMW Models

• 1 Series – F20 / F21
• 2 Series – F22 / F23 / F45 / F46
• 3 Series – E90 / E91 / F30 / F31 / G20
• 4 Series – F32 / F33 / F36
• 5 Series – F10 / F11 / G30 / G31
• 7 Series – F01 / F02 / G11 / G12
• X3 – F25 / G01
• X4 – F26 / G02
• X5 – E70 / F15
• X6 – E71 / F16
• Selected MINI applications

Part Numbers

TOPRAN: 503 428

BMW / MINI OE:

• 17127799184
• 17 12 7 799 184
• 7799184

Cross References:

• VAICO V20-2362
• ESEN SKV 43SKV620
• METZGER 2420577 / 4010214
• ORIGINAL IMPERIUM 230105
• Metalcaucho 32334

What's Included

✔️ 1x Coolant flange blanking plug
✔️ Sealing O-ring
✔️ Retaining clip

Important

❗ Coolant-system sealing plug – not an expansion tank cap
❗ Supplied complete with seal and retaining clip
❗ Suitable for many BMW petrol & diesel applications
❗ Verify OE 17127799184 before ordering

Fitment Summary

BMW & MINI | Petrol & Diesel | Coolant Flange Blanking Plug | OE 17127799184 | TOPRAN 503 428