
Did you know?
Cooling systems have an effect on everything from power to gas milage and everything inbetween.
When was the last time that you changed an oil filter? Added coolant or brake fluid? How about replaced your radiator cap?
Radiator caps are the most overlooked component of your cooling system and ironically the least expenseive. Replacing your radiator cap regularly can save your customer money at the pump and save wear and tear on your cooling sytem overall. Caps have a seal that can wear away over time. And over time your fuel costs will also increase.
*Measurments are reference only and may vary slightly with application.
*Matching EXISITING PSI is critical in selecting your radiator cap.
Want more information?
Contact your local Northern Radiator Sales Rep
How to choose the correct radiator cap

FILLER NECK WIDTH (outer dimension) | FILLER NECK DEPTH | PSI (lbs) | FOR COOLANT RESERVOIR SYSTEMS | OVERALL HEIGHT | OVERALL DIAMETER | NOTES | PART # |
32mm (inner dimension) | 16 mm | 13 | YES | .96” | 1.77” | Upper seal | RW0021-6 |
32mm (inner dimension) | 16 mm | 16 | YES | .96” | 1.77” | Upper seal | RW0021-23 |
2.2" | .75” | 4 | NO | 1” | 2.3” | NO upper seal | RW0021-11 |
2.2” | .75” | 7 | YES | 1” | 2.3” | Upper seal | RW0021-1 |
2.2” | .75” | 10 | YES | 1” | 2.3” | Upper seal | RW0021-5 |
2.2” | .75” | 13 | YES | 1” | 2.3” | Upper seal | RW0021-2 |
2.2” | .75” | 13 | YES | 1.4” | 2.3” | Lever Lift with upper seal | RW0021-3 |
2.2” | .75” | 16 | YES | 1” | 2.3” | Vented Drop Valve with upper seal | RW0021-12 |
2.2” | .75” | 16 | YES | 1” | 2.3” | Upper seal | RW0021-22 |
2.2” | .75” | 10 | YES | 2.3” | 3.5” | Massey Freguson Special | RW0021-24 |
2.2” | 1" | 4 | NO | 1.2” | 2.3” | NO upper seal | RW0021-15 |
2.2” | 1" | 7 | NO | 1.2” | 2.3” | NO upper seal | RW0021-14 |
2.2” | 1" | 10 | NO | 1.4” | 2.3” | NO upper seal | RW0021-25 |
2.7” | .75” | 4 | NO | .96” | 2.8” | NO upper seal | RW0021-9 |
2.7” | .75” | 7 | NO | .96” | 2.8” | NO upper seal | RW0021-4 |
2.7” | .75” | 7 | YES | .96” | 2.8” | Upper seal | RW0021-292B |
2.7” | .75” | 10 | NO | .96” | 2.8” | NO upper seal | RW0021-40 |
2.7” | .75” | 15 | YES | .96” | 2.8” | Upper seal | RW0021-294B |
2.2" | .75" | 13 | YES | 1.0" | 2.3" | Upper seal | RW0021-80 |
2.2" | .75" | 7 | NO | 1.0" | 2.3" | NO upper seal | RW0021-81 |