Raw Water Strainer


Raritan Raw Water Strainer
SKU: 84336
Mfg# RWS
UNIT: Each
In Stock - Ships out in 1 Business Day


  • Provides protection against clogged intake lines
  • Accumulated debris can be easily seen through the clear, high strength body
  • High capacity flow
  • Removable filter basket for easy cleaning
  • Trouble free installation
  • Ideal for use with marine toilets, engine cooling, air conditioning systems and other accessories that use seawater intake
  • 1-1/2" NPT Ports

Raritan Raw Water Strainer

Installation and Maintenance Instructions as Provided by Manufacturer

Manufacturer's Warning!

Raritan Engineering Company, Inc. recommends that a qualified person install this product. Equipment damage, injury to personnel or death could result from improper installation. Raritan Engineering Company, Inc. accepts no responsibility or liability for damage to equipment, or injury or death to personnel that may result from improper installation or operation of this product.

Hazard of Flooding. Failure to observe cautions below could result in flooding, property damage or loss of life. Failure of the Raw Water Strainer (RWS), after installation below the waterline, can result in sinking of your vessel.

  1. Any installation made below the waterline must have hoses connected properly and connections double clamped; be tested and responsibly maintained to protect the installation.
  2. Always be sure both inlet and outlet seacocks or valves are in the closed position when the strainer will not be in use or when leaving the boat unattended.
  3. Use only PVC fittings. Never install the Raw Water Strainer using metal adapters. The different expansion rates of metal and plastic can result in leakage or cracks.
  4. Use only teflon tape or paste; never install using any other sealants or lubricants.


  1. The RWS should be installed where it can be secured to a bulkhead or other solid area. Locate the RWS above the waterline, when possible.
  2. Mount with cap upright using the molded bracket. Secure with stainless steel bolts, washers and nuts or stainless steel wood screws at least 11/4" long.


CAUTION: Plumbing Connections can not be used to support the RWS. Install all hoses to RWS before mounting to prevent damage to mounting bracket. Close seacocks before installing strainer. DO NOT OVER TIGHTEN the adapters; tighten only enough to prevent leakage. Certain joint compounds will cause deterioration of the plastic material resulting in cracks around the threaded areas. Never use metal adapters as the different rates of expansion may cause leakage or cracking of the plastic case.

  1. Arrows indicate direction of flow in and out of strainer.
  2. Do not use teflon tape on cap threads; use only Superlube (SL) to lubricate cap threads.
  3. Use teflon tape on threads of fittings and adapters. Secure proper size adapters onto intake and discharge fittings.
  4. Connect hoses to the adapters using two stainless steel hose clamps per connection.
  5. Tighten cap onto strainer body. A positive stop prevents over tightening. DO NOT TIGHTEN PAST STOPS.
  6. Once installed, open seacocks and check strainer installation for leaks. Turn on the equipment the strainer is protecting. Check for leakage at the fittings. If leakage occurs shut off equipment and recheck installation.


Periodically check strainer for debris. Check all connections for leaks. Strainer basket can be removed for easy cleaning.


Close seacocks, drain the strainer completely. Do not add anti-freeze compounds, they will cause deterioration of the plastic, causing it to crack.


Part #Description
RWS13Reducing Bushing 1-1/2" x 1/2"
RWS14Insert Reducing Male Adapter 1-1/4" x 3/4"
RWS15Insert Reducing Male Adapter 1-1/2" x 3/4"
RWS17Insert Reducing Male Adapter 1-1/2" x 1"



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The length of the warranty may vary by product, please refer to your product for the exact terms and conditions of the warranty for your purchase.


  • All returns must be recevied within 30 days of receipt of the order.
  • Manufacturer defects reported within 30 days of receipt will be supplied a pre-paid label for return shipping upon approval.
  • Please contact Go2marine LFS Marine and Outdoor for Manufacture Defects, Returns and help with Warranties.