5″ Circular Siphon Diaphragm

5″ Circular Siphon Diaphragm

Heavy-duty 5-inch rubber replacement circular siphon diaphragm with 3/8-inch centre hole — purpose-built for siphon pumps, diaphragm pumps, and fluid transfer equipment requiring a flexible, sealing membrane for reliable fluid movement in industrial, agricultural, and general maintenance applications.

Key Benefits

• 5-inch diameter for standard siphon pump compatibility
• 3/8″ centre hole for pump shaft and fitting alignment
• Flexible rubber construction for consistent seal and stroke
• Replacement-grade quality
• Smooth, uniform face for full seating and sealing
• Lightweight and easy to install
• Suitable for a range of fluid transfer applications
• Cost-effective replacement part
• Compatible with standard diaphragm pump configurations

Technical Specifications

• Type: Circular Siphon pump diaphragm
• Diameter: 5 inches
• Centre Hole: 3/8 inch
• Material: Rubber
• Colour: Grey
• Application: Siphon pumps, diaphragm pumps, fluid transfer equipment

Features

• Flat circular rubber diaphragm for direct drop-in replacement
• Uniform thickness across the full disc for balanced, consistent pump stroke
• Smooth face surfaces for complete seating against pump body mating surfaces
• 3/8″ centre hole sized for standard pump shaft and mounting hardware
• Flexible rubber material accommodates pump stroke deflection without cracking or fatiguing
• Chemical-resistant composition suitable for water, light oils, and general-purpose fluid transfer
• Compact 5-inch diameter compatible with standard siphon pump bodies

Perfect For

• Siphon pump diaphragm replacement
• Diaphragm pump maintenance and servicing
• Fluid transfer pump repair
• Water transfer equipment
• Agricultural sprayer pump servicing
• Chemical dosing pump maintenance
• Industrial fluid handling equipment
• General pump maintenance and repair
• Workshop and field pump servicing
• Preventive maintenance stocking

Key Features

• 5-Inch Diameter: Sized to fit standard 5-inch siphon pump bodies for direct replacement without modification
• 3/8″ Centre Hole: Pre-punched centre bore fits standard pump shaft and mounting bolt configurations for fast, tool-minimal installation
• Flexible Rubber Material: Provides the elastic deformation required for effective diaphragm pump stroke while maintaining a consistent seal throughout the pump cycle
• Uniform Construction: Even thickness and flat face profile ensures full contact with pump body seating surfaces, preventing bypass and maintaining pump efficiency
• Chemical Resistance: Rubber compound offers resistance to water, mild chemicals, and light petroleum-based fluids common in siphon and transfer pump applications
• Direct Replacement Part: Drop-in fit for standard 5-inch diaphragm pump configurations reduces downtime during maintenance and field servicing

Application Instructions

1. Ensure pump is disconnected from its power or drive source before servicing
2. Drain and relieve any residual pressure in the pump and connected lines
3. Remove pump cover or diaphragm housing bolts and carefully separate the pump body
4. Remove the worn or damaged diaphragm, noting its orientation
5. Inspect pump body seating surfaces for damage or debris and clean thoroughly
6. Position the new 5″ diaphragm with the centre hole aligned to the pump shaft or mounting bolt
7. Seat the diaphragm evenly against the pump body — ensure no folding or uneven seating
8. Reassemble pump housing and tighten cover bolts evenly in a cross pattern
9. Reconnect pump to drive source and run briefly to check for leaks or bypass
10. Replace diaphragm at regular maintenance intervals or at first sign of cracking, hardening, or reduced pump output

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