The Shurflo 181-201 Accumulator Tank is a 24 oz. bladder-type pressure storage vessel designed to eliminate pump cycling, smooth out pressure spikes, and reduce noise in residential and marine water delivery systems. With NSF-listed components and a replaceable butyl diaphragm, this compact unit installs inline between your pump and fixtures to extend pump life and deliver steady, consistent water pressure.
SPECIFICATIONS
Shurflo 181-201 Technical Details
| Model Number | Shurflo 181-201 |
| Capacity | 24 oz. |
| Housing Material | Nylon with butyl diaphragm |
| Port Size | 1/2" NPT female |
| Dimensions | 3.75" diameter × 8.75" long |
| Maximum Pressure | 125 psi |
| Certifications | NSF Listed |
| Included | Mounting bracket |
INSTALLATION & USE
How to Install the Shurflo 181-201
- Mount the accumulator tank vertically between your water pump discharge line and the delivery fixtures using the included bracket
- Thread 1/2" NPT male fittings into the tank port, applying thread sealant or Teflon tape to ensure leak-free connections
- Precharge the tank bladder to approximately 2/3 of your pump's cut-in pressure using a standard tire valve (consult your pump manual for optimal pressure)
- Run the system and verify smooth, pulsation-free water flow at all fixtures
- Check connections for leaks and adjust bladder precharge if necessary to optimize performance
COMPATIBILITY
System Requirements
The Shurflo 181-201 accumulator tank is compatible with all Shurflo water delivery pumps and most other brands rated up to 125 psi. It works with RV water systems, marine freshwater systems, cabin and cottage plumbing, pressure washer setups, and any application where a demand-style diaphragm pump creates pulsation or cycles too frequently. The 1/2" NPT female port fits standard plumbing fittings and requires no special adapters in most residential and mobile installations.
🔧 Pro Tip: Set the bladder precharge to about 5-7 psi below your pump's cut-in pressure for optimal performance. Too high and the tank won't absorb pressure spikes; too low and you'll lose storage capacity and still get pump cycling.
