Neptune RC3G-15 Radiator Cap | 103 kPa (60-27)
Neptune RC3G-15 Radiator Cap 103kPa 60-27 is a clip-on metal radiator cap rated at 103 kPa (15 psi) for a 60-27 (60 mm outer, 27 mm deep) filler neck. The in-between rating for vehicles specified at 15 psi. Replaces caps stamped 103 kPa, 15 psi or 1.05 bar with the large 60-27 neck.
Key Features
- Genuine Neptune quality with calibrated pressure spring
- Correct 103 kPa rating where 90 is too little and 110 too much
- Durable metal construction with fresh sealing gaskets
- Keeps boiling point up and cooling system sealed
- Match the stamping on your old cap: 15 psi = this cap
Specifications
- Pressure rating: 103 kPa (15 psi / 1.03 bar)
- Filler neck size: 60-27 (60 mm outer, 27 mm deep)
- Material: Metal
- Part reference: RC3G-15
Vehicle Applications | What This Cap Fits
This size is not tied to a specific TecDoc vehicle list. Match it by the pressure stamping and the 60 mm neck with 27 mm reach of the cap you are replacing, and it will do the job on any radiator using that neck.
How to Check You Have the Right Cap
Your current cap is stamped with its pressure rating on the top face. Match the pressure (kPa or psi) and the neck size, or bring your old cap to our Kempton Park counter and we will match it for you. Never open a radiator or expansion cap while the engine is hot.
Radiator Cap Range at Greyhound Auto Retail
Clip-on metal caps: RC1-13 (90kPa, 44-15), RC1-16 (110kPa, 44-15), RC2-13 (90kPa, 46-22), RC2-16 (110kPa, 46-22), RC3G family 60-27: 48kPa, 69kPa, 90kPa (standard / long reach), 97kPa, 103kPa, 110kPa and 124kPa. Expansion tank caps: 97kPa, 117kPa, 138kPa and a 200kPa BMW cap.
Buying oil too? Engine oil of R300 or more gets you 10% off all filters, added automatically at checkout.









There are no reviews yet.