Donaldson Mushroom Rain Cap - OEM Number: H77-0010

The Donaldson Mushroom Rain Cap (OEM H77-0010) is a direct replacement intake protection component designed for use on a range of industrial engines and machinery fitted with vertical air intake or exhaust stacks. It is used to prevent rain, snow, and airborne debris from entering the intake system while still allowing unrestricted airflow during operation.

Manufactured to OEM specifications, this rain cap is engineered for durability, weather resistance, and reliable performance in harsh outdoor environments. Its “mushroom” style design provides effective shielding while maintaining low restriction to airflow, making it suitable for both on-road and off-road equipment applications.

FUNCTION AND OPERATION

• Prevents rain, snow, and debris ingress into air intake systems
• Allows continuous airflow during engine operation
• Protects engine from contamination and potential internal damage
• Reduces maintenance caused by water or dirt ingress
• Designed for passive operation with airflow-driven opening characteristics

TECHNICAL DETAILS

• OEM Part Number: H77-0010
• Type: Mushroom-style rain cap / intake stack cap
• Function: Air intake protection component
• Application: Engine air intake or exhaust stack outlet
• Construction: Corrosion-resistant metal or coated steel assembly
• Design: Weighted, self-operating cap allowing airflow while shedding water and debris

Donaldson rain caps are part of a wider intake protection range designed for heavy-duty engine systems, where they are commonly mounted on vertical intake stacks using clamp fittings for secure installation.

TYPICAL APPLICATIONS

Suitable for a range of equipment, including:

• Construction and plant machinery
• Diesel generators and stationary power units
• Agricultural and forestry equipment
• Industrial engines with vertical intake stacks
• Off-highway and heavy-duty vehicles

IMPORTANT INFORMATION

Always confirm the correct OEM part number and stack diameter before ordering, as rain cap sizing varies depending on intake pipe dimensions and engine configuration. Incorrect sizing or installation may reduce airflow efficiency or compromise protection against water ingress.

DELIVERY OPTIONS (UK mainland only)

Next Day Delivery*
£11.95 or FREE for orders over £150
Orders placed before 4pm Monday to Friday will be delivered on the next business day.
Orders placed after 4pm on Friday will be delivered the following Tuesday.
*Next day delivery applies to stocked items only. Availability can be found on the product pages.

Premium Delivery*
£27.50 for delivery before 10:30am
£20.00 for delivery before 12:30pm
*Premium delivery applies to stocked items only. Availability can be found on the product pages.

For all other countries, please click here for full delivery information.

**Separate carriage charges apply to bulk products such as 205L barrels.