High-quality short reach radiator pressure caps manufactured with a Grade 304 stainless steel case, designed for classic and older cooling systems requiring a 19mm inner depth cap.
These are classic bayonet-type radiator caps, suitable for vehicles and applications where corrosion resistance and durability are essential. The stainless steel construction makes them ideal for classic cars, restored vehicles, and specialist applications where zinc-plated caps are not preferred.
All caps are precision assembled to ensure reliable pressure regulation and correct sealing at the filler neck.
Key Features
Short Reach Design – 19mm inner depth
Fits Radiator Filler Neck: 56mm diameter
Classic Bayonet Type Cap
Case Material: Grade 304 Stainless Steel
Strong Rubber Seals for reliable pressure control
Corrosion-Resistant Construction
Suitable for Classic & Vintage Vehicles
Available Pressure Ratings
Select the required pressure option from the dropdown:
Pressure Rating
Application
4 lb
Low-pressure / older cooling systems
13 lb
Standard classic vehicle use
15 lb
Higher-pressure classic systems
Technical Specifications
Specification
Detail
Cap Type
Radiator Pressure Cap
Reach Type
Short Reach
Filler Neck Size
56mm
Inner Depth
19mm
Case Material
304 Stainless Steel
Seal Type
Rubber
Mounting
Bayonet Fit
Vehicle Type
Classic / Vintage / Specialist
Important Fitment Notes
This cap is short reach – always measure your radiator filler neck inner depth (19mm) before ordering.
Not suitable for long-reach radiator necks.
Pressure rating must match your cooling system requirements.
If you are unsure which pressure or reach you require, please contact us before purchase.
What’s Included
1 × Stainless Steel Short Reach Radiator Pressure Cap
Pressure rating as selected
Why Choose This Cap?
Premium 304 stainless steel for long service life
Correct fit for 56mm classic radiator filler necks
Multiple pressure options for accurate system matching
Ideal upgrade or replacement for classic restorations
