Large Commercial Radiator Cap 70mm – Round or Winged – 4lb to 20lb

Product Description

Heavy-duty large commercial radiator pressure caps designed for truck, lorry, plant and agricultural cooling systems. Manufactured with a zinc-coated steel case for corrosion resistance and long service life, these caps are available in round and winged styles to suit different handling preferences.

All caps are engineered to fit 68 mm radiator filler necks with a required inner depth of 19 mm, making them suitable for a wide range of commercial and industrial applications.

Available in multiple pressure ratings to match manufacturer requirements, from low-pressure systems through to high-pressure cooling setups.

Key Features

• Large 70 mm cap case diameter
• Available in Round or Winged versions
• Winged version overall width: 90 mm (including wings)
• Fits 68 mm radiator filler necks
• Required filler neck inner depth: 19 mm
• Spring length: 21 mm (measured from brass washer to end of spring)
• Small rubber seal diameter: 51 mm
• Zinc-coated metal case for corrosion resistance
• Suitable for trucks, lorries, agricultural machinery & plant equipment

Available Pressure Ratings

Select the required pressure from the dropdown:

• 4 lb
• 7 lb
• 10 lb
• 15 lb
• 20 lb

Technical Specifications

Typical Applications

• Commercial trucks & lorries
• Agricultural tractors & machinery
• Plant and industrial cooling systems
• Older and modern commercial radiators using 68 mm filler necks

Notes

• Always confirm filler neck diameter and depth before ordering
• Pressure rating must match vehicle or equipment specification

• Images show both round and winged variants for reference