High-quality small Japanese-type radiator pressure caps suitable for cars, motorcycles, and lawnmowers using a small-neck radiator filler. These caps are made and assembled in England (UK) and supplied by Complete Radiator Supplies, offering dependable performance across a wide range of cooling system requirements.
High-pressure variants are manufactured with a stainless steel case for superior corrosion resistance, while the low-pressure 7 psi (approx. 0.5 bar) option features a zinc-coated steel case, ideal for older or low-pressure systems.
Correct radiator cap pressure is critical for maintaining coolant boiling point, efficient heat transfer, and protecting hoses, radiators, and seals from damage.
Available Pressure Options
Select the required pressure from the dropdown menu:
Stainless Steel Case
0.9 bar
1.0 bar
1.1 bar
1.3 bar
1.4 bar
2.0 bar
Zinc Coated Case
7 psi (≈ 0.5 bar)
Key Features
Small Japanese-type radiator neck
Suitable for cars, motorbikes & lawnmowers
Stainless steel case (0.9–2.0 bar)
Zinc-coated steel case (7 psi / 0.5 bar)
High-quality rubber pressure seal
Improves cooling system efficiency
Helps prevent coolant loss and overheating
Made & assembled in England, UK
Supplied by Complete Radiator Supplies
Typical Applications
Japanese cars (classic & modern)
Motorcycles and scooters
Lawn mowers and small engines
Industrial and specialist cooling systems
Always check the manufacturer’s specified pressure and radiator neck size before ordering.
