3″ Replacement Diaphragms for Pumps

Need a 3-Inch Diaphragm That Fits Your Pump?

Finding the right 3 inch replacement diaphragms should not keep your crew waiting.

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Ken’s Distributing stocks 3-inch diaphragms for the most common trash and water pumps on the jobsite, in four materials, ready to ship the same day. This page shows what we carry, how to choose the right material, and how to confirm the fit before you order. A worn diaphragm means weak suction, poor flow, and a pump that stalls under load. Once you know your pump model and the material you need, the swap is quick.

Shop 3-Inch Diaphragms by Pump Brand

Most 3-inch pumps use a brand-specific diaphragm. Find your pump below, then choose your material. If your model is not listed, send it over and we will match it.

Pump Brand	3-Inch Models / Part Number	Materials We Stock
CH&E	3″	Rubber, Neoprene, Buna, TPE
AMT	Model 335, plus a “No Holes” variant	Rubber, Neoprene, Buna, TPE
Generac Magnum	P2726R, P2726N, P2726B, P2726TPE (No Holes available)	Rubber, Neoprene, Buna, TPE
Mud Hog	P2726 series; fits 302, 302B, 302C, 304, 305	Rubber, Neoprene, Buna, TPE
Wacker Neuson	PDI3A	Rubber, Neoprene, Buna, TPE
Gorman-Rupp	3″, plus a “No Holes” variant	Rubber, Neoprene, Buna, TPE
Multiquip	3″	Rubber, Neoprene, Buna, TPE
Riverside	3″, plus a “No Holes” variant	Rubber, Neoprene, Buna, TPE
Tsurumi	TD5-300 (2132-000-00-R rubber, 2132-000-00-N neoprene)	Rubber, Neoprene

Note that CH&E, Magnum, and Mud Hog 3-inch pumps often share the P2726 diaphragm. If you run more than one of these brands, one part number may cover all of them.

Which Material Is Right for Your 3-Inch Pump?

The material decides how long your diaphragm lasts and what fluids it can handle. Here is a plain breakdown so you can pick with confidence.

Rubber

Rubber is the budget pick for plain water and light-duty work. It flexes well and handles everyday dewatering. Many crews keep a few of our rubber replacement diaphragms on the truck as spares.

Neoprene

Neoprene is the tough all-arounder, with strong tensile strength and good resistance to weather and flex cracking. It is a smart upgrade from worn rubber for steady construction use. Browse our neoprene diaphragms to compare brands.

Buna (Nitrile)

Buna resists oils, fuels, and hydrocarbons. Pick it when you pump near diesel, lubricants, or petroleum fluids, since plain rubber breaks down fast around those.

TPE (Santoprene)

TPE blends thermoplastic strength with rubber-like flex and broad chemical resistance. It is one of the longest-lasting choices for heavy industrial service. See the full lineup of TPE Santoprene diaphragms if uptime matters most.

How to Measure a 3-Inch Diaphragm Before You Order

The “3-inch” refers to your pump’s port size, not the diaphragm itself. To get the right part the first time, check these four things:

Overall diameter, measured straight across the full diaphragm.
Bolt-hole pattern: count the holes and measure the spacing center to center. Note any “no-hole” style, common on AMT, Magnum, Mud Hog, Gorman-Rupp, and Riverside.
Center mounting hole or stud opening diameter.
Pump make and model, such as AMT 335, Mud Hog 304, Wacker PDI3A, or Tsurumi TD5-300.

Snap a photo and write down your numbers. Send both to our team and we will confirm the exact match before anything ships.

Pumps We Fit

We supply 3-inch diaphragms for every major manufacturer, including CH&E, AMT, Generac Magnum, Mud Hog, Wacker Neuson, Gorman-Rupp, Multiquip, Riverside, and Tsurumi. For Magnum and CH&E owners, our CH&E and Magnum diaphragms cover the popular P2726 trash and water pump models. Stepping up or down a size? See our 2-inch replacement diaphragms as well. Do not see your brand? Reach out and we will cross-reference it.

Why Buy From Ken’s Distributing

America’s water pump parts distributor since 1991.
Authorized dealer for Franklin Electric, Monarch, CH&E, Generac Magnum, Red Lion, Little Giant, AMT, and Wacker Neuson.
Most orders ship the same day to all 50 states and Canada.
Diaphragms built to hold up under heavy jobsite abuse.
Real people who know pumps and can confirm your fit by phone.

Bulk Orders and Contractor Pricing

Run a fleet or several crews? Set up a blanket order for your 3-inch diaphragms and lock in contractor pricing with scheduled fulfillment. That way a pump is never down waiting on a part. Ask our team about volume pricing when you request your quote.

3-Inch Diaphragm Questions, Answered

How do I know if I need a 3-inch diaphragm?

The “3-inch” refers to your pump’s port or discharge size. Check the model plate or measure the discharge outlet. When in doubt, send us your make and model.

Do CH&E, Magnum, and Mud Hog share the same 3-inch diaphragm?

Often, yes. These brands frequently use the P2726 diaphragm in the same material. We will confirm the right part number for your exact pump.

What does the “No Holes” version mean?

Some pumps use a diaphragm without bolt holes, held by a center plate instead. Count your bolt holes before ordering so you get the matching style.

How fast can I get my part?

Most orders ship the same day, nationwide and to Canada.

Can I order in bulk?

Yes. We offer blanket orders and contractor pricing for shops and multi-crew operations.

Get a Quote on Your 3-Inch Diaphragm

Tell us your pump brand, model, and material, and we will get you the right part fast. Fill out the quick form with your name, email, phone, and pump details, and our team will reply with pricing and availability. Prefer to talk it through? Call (303) 699-7845 or email kendisco@yahoo.com and we will confirm your fit on the spot.

Get a Fast Quote from a Pump Specialist