Your diaphragm material determines performance, durability, and chemical compatibility. Ken’s Distributing Company supplies high-grade replacement diaphragms designed to fit the most common 2-inch and 3-inch diaphragm pumps used in construction, grinding and grooving operations, municipal water removal, and industrial transfer applications.
Below is an overview of each diaphragm material we offer so buyers can identify the best option for their pump’s environment and media handling.
Neoprene delivers excellent tensile strength and balanced performance across a wide range of water-handling applications. It is highly resistant to weathering, flex cracking, and general-purpose pumping wear. Many concrete cutting and surface prep companies prefer neoprene because it holds shape and firmness even under heavy vibration and continuous use.
Rubber diaphragms offer dependable flexibility and long-term performance in standard water movement, groundwater control, pond pumping, and clean-water transfer. Rubber is a cost-effective replacement option for pump owners who need a reliable sealing surface that performs under repetitive expansion and contraction.
Buna nitrile diaphragms provide outstanding resistance to oils, fuels, hydrocarbons, and abrasive water conditions. This material is ideal for contractors working with oily wastewater, slurry, or contaminated groundwater. Buna maintains strong elasticity under pressure and offers durable wear characteristics for long pumping cycles.
Santoprene TPE diaphragms combine the durability of thermoplastic construction with the flexibility of rubber, making them one of the longest-lasting options available. They resist fatigue, chemical exposure, temperature swings, and mechanical stress. Santoprene is preferred for demanding environments where failure is not an option and downtime carries a high cost.
Santoprene Diaphragm Material – Most Larger Diaphragm Pump Makes
| A | B | C |
|---|---|---|
| 13" | 1-3/4" | 4 7/8" |
| 14 3/4" | 2-1/2" | 5 1/2" |
Neoprene Diaphragm Material – Most Larger Diaphragm Pump Makes
| A | B | C |
|---|---|---|
| 10-1/2" | 1-1/2" | 2-3/4" |
| 11-1/4" | 1-1/2" | 3-3/4" |
| 13" | 1-3/4" | 4-7/8" |
| 14-3/4" | 2-1/2" | 5-1/2" |
Neoprene Diaphragm Material – Most Smaller Diaphragm Pump Makes
| A | B | C |
|---|---|---|
| 5" | 1-1/2" | 0.5" |
| 5.5" | 1-1/2" | 0.5" |
| 6" | 1-1/2" | 0.5" |
| 6.5" | 1-1/2" | 0.5" |
| 7" | 1-1/2" | 0.5" |
| 8" | 1-1/2" | 0.5" |
Proper sizing ensures a correct fit and maximum pumping efficiency. Measure the diaphragm across its widest point, making sure the diaphragm sits flat. Confirm thickness, bolt pattern, and edge design if applicable.
If you are unsure which size or material is required, Ken’s Distributing Company can match your diaphragm by pump brand, model, or application type.
These replacement diaphragms fit the major diaphragm pump manufacturers used in construction, industrial work, municipalities, and grinding operations.
Compatible brands include
and other industry-standard 2-inch and 3-inch diaphragm pump designs widely used throughout North America.
Contractors rely on diaphragms that deliver consistent performance under heavy abuse conditions, including slurry, slurry-laden water, abrasive materials, drilling runoff, cooling water, and contaminated groundwater. Ken’s Distributing Company has supplied pump parts across the industrial and construction sectors for decades, and we maintain one of the strongest inventories of replacement diaphragms in Buna, neoprene, rubber, and TPE.
We support both small operators and large multi-location companies with bulk order options, fast fulfillment, and competitive pricing across the U.S. and Canada. Free shipping applies to complete pumps; repair parts and diaphragms ship quickly at standard rates.
Whether you operate one diaphragm pump or manage multiple teams across several locations, you need a consistent supply of diaphragms to keep equipment running. Supply delays, price increases, and unexpected downtime all impact productivity and profitability.
Ken’s Distributing Company’s Blanket Order Program gives you a strategic, year round way to guarantee diaphragm availability, stabilize pricing, and simplify procurement for contractors, municipalities, industrial operations, and rental companies of every size.
For grinding and grooving companies, concrete cutting contractors, and fleet managers operating multiple 2-inch and 3-inch diaphragm pumps, bulk orders help reduce downtime by ensuring parts are always on hand. Discount tiers are available for high-volume diaphragm orders, and custom stocking programs can be arranged for year-round supply.
Whether you need Buna, neoprene, rubber, or Santoprene TPE diaphragms, Ken’s Distributing Company supplies high-performance replacements ready to ship. These diaphragms are engineered for durability, pressure stability, and long-term reliability under demanding job-site conditions.
If you need assistance confirming your diaphragm size or material, our team can help identify the correct part based on your pump model or application. We serve all 50 states and Canada.
