Neptune RC3G-7 Radiator Cap | 48 kPa | 60-27
The Neptune RC3G-7 radiator cap keeps your cooling system sealed and holding the correct pressure. By raising the boiling point of the coolant, it protects your engine against overheating and coolant loss. A worn cap is one of the most common causes of overheating, and replacing it takes seconds with no tools.
Specifications
- Pressure rating: 48 kPa (0.48 bar / 7 psi)
- Filler neck: 60 mm outer diameter, 27 mm depth
- Reach: Standard
- Material: metal body with pressure-calibrated spring seal
- Replaces: TG3-7M
- Brand: Neptune (Absorbing the Heat)
The RC3G-7 is the low-pressure cap in the range at just 48 kPa. It is intended for older vehicles and commercial cooling systems designed for low pressure. Fitting a standard 90 or 110 kPa cap on such a system can damage the radiator, so always match the original rating.
Vehicle Applications | What This Cap Fits
The TecDoc parts catalogue lists 2 vehicle applications for this cap across Hino trucks. Vehicle listings are a guide only. Always match the pressure stamping, neck size and reach of the cap you are replacing before ordering.
How to Choose the Right Radiator Cap
- Check the pressure stamping on your old cap: it is shown in kPa, bar or psi. The number after the dash in the Neptune code is the psi rating: RC1-13 = 13 psi (90 kPa), RC2-16 = 16 psi (110 kPa), RC3G-7 = 7 psi (48 kPa).
- Measure the filler neck: outer diameter and depth. 44-15 is the small car neck, 46-22 the mid size, 60-27 the large neck used on many bakkies, trucks and older vehicles.
- Check the reach: if your original cap has a longer inner shaft that seals deeper in the neck, choose the long-reach RC3G-13L.
- Never fit a higher pressure rating than your system was designed for.
Neptune Radiator Cap Range: Compare All 8
| Code | Pressure | Neck Ø | Depth | Reach | Price |
|---|---|---|---|---|---|
| RC1-13 | 90 kPa (13 psi) | 44 mm | 15 mm | Standard | R60 |
| RC1-16 | 110 kPa (16 psi) | 44 mm | 15 mm | Standard | R55 |
| RC2-13 | 90 kPa (13 psi) | 46 mm | 22 mm | Standard | R55 |
| RC2-16 | 110 kPa (16 psi) | 46 mm | 22 mm | Standard | R60 |
| RC3G-13 | 90 kPa (13 psi) | 60 mm | 27 mm | Standard | R80 |
| RC3G-16 | 110 kPa (16 psi) | 60 mm | 27 mm | Standard | R80 |
| RC3G-13L | 90 kPa (13 psi) | 60 mm | 27 mm | Long reach | R85 |
| RC3G-7 | 48 kPa (7 psi) | 60 mm | 27 mm | Standard | R85 |
All Neptune radiator caps are stocked in Kempton Park with fast delivery across South Africa. Not sure which cap fits? WhatsApp us a photo of your old cap and we will match it.
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