3 in. Honda diaphragm pump

Diaphragm pumps are positive displacement pumps. They pump a specific volume for each pump cycle. Diaphragm pumps move fluids more slowly than centrifugal pumps, but can handle mud and larger amounts of solids including abrasive materials. They also tolerate air being drawn into the pump, and can be run dry without damage. Diaphragm pumps are widely used on construction sites to control seepage in excavations, and for pumping septic (honey wagon) systems and operating well point systems.

Models DP2H and DP3H include Honda GX160 with Oil Alert™ to help protect the engine against damage from operation with an inadequate oil supply. Riverside diaphragm pumps feature a straight-through, self-priming design. The rubber elastomer diaphragm and flapper valves are easily replaced on site, and the aluminum pump body keeps weight down for easier transport. With a rubber diaphragm rather than TPE, you can expect longer life which may tear the TPE. Riverside is the only mud pump with a true rubber diaphragm still. The right pump for -Toilet sewage, Construction dewatering, Mud, sand & sludge, Utility dewatering, Limited well pointing.

Replacement diaphragm is 03438, also fits Homelite DP3 111DP3 HDP3 wdp30 GDP-80HX as the one picture shows, these pumps have been around for decades. stow 

Suction and discharge port size cannot be reduced. Due to positive pumping action of diaphragm pumps, by all mfr's, the discharge is recommended to only be 25FT long unless oversized. Discharge can not be restricted. There is no relief valve.

If you have a obs thompson series D 3" 25108 you will need to replace the entire pump with one from Riverside.

Optional wheel kit: Makes it even easier to move Riverside Pumps around the work site. Includes handles, two axles for correct fit, large wheels to move through mud, and all required hardware.