Series SFI-400 MIDWEST Sight Flow Indicator

Inexpensive Protection for Expensive Equipment and Systems

Series 400 Sight Flow Indicators are manufactured of quality materials and safety tested to assure long, dependable service at economical prices. The 400 Series offer threaded or ANSI flanged process connections, tube style viewing, and bodies of cast iron or 316 SS. Featured in the 400 is glass tube construction offering easy flow viewing from any angle.

Models & Ordering

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Shipping Information

All shipping times are dependent on product availability at time of shipment.

Although we make every effort to ensure a continuous supply of our products, occasional circumstances may force us to temporarily run out of a product, or have shipping delays. Should this occur, customers will be notified soon after placement of any orders for such products and, if applicable, items will be put on backorder. For orders requiring expedited shipment, our customer service team can be contacted to confirm product availability

COVID-19 Update: Due to high customer demand, lead time on some products may be up to two weeks. While this is a developing health situation, we are working continuously to take the necessary measures to ensure that the products you need are available with minimal interruption.

Model Description Usually Ships* Price Order
Ships: 1-2 Weeks
Price: $218.00
Sight flow indicator, 1" body, 5.625" (143 mm) length, 4.250" (108 mm) flange dia., 2.000" (51 mm) viewing dia., 6.2 lb (2.8 kg). 1-2 Weeks* $218.00 Order
Ships: 1-2 Weeks
Price: $272.00
Sight flow indicator, 1-1/2" body, 5.875" (149 mm) length, 5.000" (127 mm) flange dia., 2.500" (64 mm) viewing dia., 8.7 lb (4.0 kg). 1-2 Weeks* $272.00 Order
Ships: 1-2 Weeks
Price: $240.00
Sight flow indicator, 1-1/4" body, 5.750" (146 mm) length, 4.625" (117 mm) flange dia., 2.000" (51 mm) viewing dia., 7.6 lb (3.5 kg). 1-2 Weeks* $240.00 Order
Ships: 1-2 Weeks
Price: $303.00
Sight flow indicator, 2" body, 6.125" (156 mm) length, 6.000" (152 mm) flange dia., 3.000" (76 mm) viewing dia., 13 lb (6.0 kg). 1-2 Weeks* $303.00 Order


Compatible gases and liquids.
Wetted Materials:
Tube: Borosilicate; Body: cast iron or 316 SS; Gasket: PTFE.
Temperature Limit:
200°F (93°C).
Pressure Limit:
50 psig (3.45 bar).
Threaded or flanged.

Product Literature

Catalog Pages



I see that the SFI-300 MIDWEST Sight Flow Indicator has a flow direction shown as an arrow. What will happen if water flows in the opposite direction? Will the rotating impeller rotate in both directions? I want to use the indicator on a wakeboard boat to show water being pumped in both directions on a wake ballast system.
The inlets and outlets for SFI-300 are designed for flow to only be in one direction. You could physically push flow in the opposite direction, but you would risk damaging the impeller, and you would not get a true indication of flow.

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