5½”Rectangular Siphon Diaphragm

5½” Rectangular Siphon Diaphragm

Heavy-duty 5½-inch rectangular siphon diaphragm with 3/8-inch centre hole — designed for siphon pumps, diaphragm pumps, and fluid transfer equipment requiring a rectangular sealing membrane for reliable fluid movement in industrial, agricultural, and general maintenance applications.

Key Benefits

• 5½-inch rectangular form factor
• 3/8″ centre hole for pump shaft and fitting alignment
• Flexible rubber construction for consistent seal and stroke
• Rounded corner profile for clean pump body seating
• 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 rectangular diaphragm pump configurations

Technical Specifications

• Type: Siphon pump diaphragm
• Shape: Rectangular with rounded corners
• Size: 5½ inches
• Centre Hole: 3/8 inch
• Material: Rubber
• Colour: Off-white
• Application: Siphon pumps, diaphragm pumps, fluid transfer equipment

Features

• Rectangular rubber diaphragm for direct drop-in replacement in rectangular pump body configurations
• Rounded corner profile for clean fitment against pump housing seating surfaces
• Uniform thickness across the full diaphragm 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

Perfect For

• Siphon pump diaphragm replacement
• Rectangular 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

• Rectangular Form Factor: Sized and shaped to fit standard rectangular siphon pump bodies — not interchangeable with round diaphragm configurations
• 5½-Inch Size: Covers standard rectangular pump diaphragm dimensions for direct replacement without trimming or 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

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 5½” rectangular diaphragm with the centre hole aligned to the pump shaft or mounting bolt
7. Align the diaphragm corners to the pump housing corners — 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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