SHURflo 182-200 RV Accumulator Tank: Plumbing Diagram & Parts

The SHURflo 182-200 is a 24 oz nylon accumulator tank that helps smooth pressure fluctuations and reduce rapid pump cycling in suitable RV fresh-water systems. Its diaphragm holds an air pre-charge on one side and pressurized water on the other. The accumulator connects after the water pump, on the pressurized side of the plumbing—not between the fresh-water tank and pump inlet.

Typical RV accumulator plumbing diagram

The diagram below shows the direction of water flow in a common pressure-pump installation. The accumulator is connected downstream of the pump, ahead of downstream restrictions that create backpressure. It can be connected inline or by a tee, according to the plumbing layout.

Inline versus tee installation

Accumulator and related fresh-water parts

These are separately listed NewRVParts components used in related SHURflo fresh-water systems. Select fittings and accessories for your specific pump and tubing; the entire group is not a required installation kit.

SHURflo 182-20024 oz accumulator tank30 PSI factory pre-charge; 1/2-inch male NPSM ports; intended for the pressurized side of the system.View productSHURflo 94-591-01Flexible pump silencing kitTwo flexible hoses and pipe couplers for compatible pump connections; helps isolate line vibration.View productSHURflo 4008-101-E6512V Revolution fresh-water pumpAutomatic-demand pump with internal bypass; an accumulator is optional, not required for this pump.View productSHURflo 255-315Inlet strainer, female swivel outlet50-mesh screen; 1/2-inch NPSM inlet with a female-swivel outlet.View productSHURflo 255-313Inlet strainer, threaded connections50-mesh screen; 1/2-inch NPSM inlet and outlet.View product

Need to select an inlet strainer by fitting style? See our SHURflo 255-series strainer connection guide. For internal 4008 pump repair components, visit the SHURflo 4008/4028 pump parts diagram.

Manufacturer tank and installation illustrations

SHURflo's original Model 182 manual identifies the air valve, base and two 1/2-inch water ports. It also illustrates the three plumbing methods described above, with a flow path from the tank to pump, accumulator, hot-water tank and fixtures.

Open SHURflo Model 182 illustrated installation manual (PDF)

Tap the image below to open the full-size manufacturer drawing.

SHURflo 182-200 specifications & pre-charge

Checking the air pre-charge

1. Switch the pump off, then open at least one faucet to relieve water pressure.
2. Measure the accumulator's air pre-charge at its air valve with a pressure gauge.
3. For a pressure-switch pump system, adjust the pre-charge to match the pump's actual cut-in (restart) pressure, following the tank manual.
4. Refit the air valve cap tightly and verify normal water-pump operation.

If water comes from the air valve, the diaphragm has failed and the tank must be replaced. SHURflo states that there are no replacement repair kits for the Model 182 accumulator. Winterize the water plumbing as directed by the RV and pump manufacturers; do not allow the accumulator to freeze.

For complete specifications, see the SHURflo 182-series product specifications and the illustrated manual linked above.

Browse all SHURflo pump parts diagrams by model

See when an accumulator is relevant to freshwater pump plumbing