Neptune RC1-16 Radiator Cap | 110 kPa | 44-15
The Neptune RC1-16 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: 110 kPa (1.10 bar / 16 psi)
- Filler neck: 44 mm outer diameter, 15 mm depth
- Reach: Standard
- Material: metal body with pressure-calibrated spring seal
- Replaces: TG1-16
- Brand: Neptune (Absorbing the Heat)
Vehicle Applications | What This Cap Fits
The TecDoc parts catalogue lists 239 vehicle applications for this cap across Toyota, Honda, Nissan, Mazda, Ford, Isuzu, Suzuki, Mitsubishi, Daihatsu, Citroën, Peugeot, Daewoo, Lexus and Subaru. 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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