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  3. Test Instruments & Gauges
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  5. Flow Measuring Instruments
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  7. Sight Glass Flow Indicators
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Sight Glass Flow Indicators (544 items)

Dwyer Instruments Sight flow indicator, 3/4" body, 4.000" L x 2.250" D x 2.563" H (102 x 57 x 65 mm), 1.5 lb (0.7 kg). SFI-100-3/4
Dwyer Instruments

Sight flow indicator, 3/4" body, 4.000" L x 2.250" D x 2.563" H (102 x 57 x 65 mm), 1.5 lb (0.7 kg).

Zoro # G5173944
Mfr # SFI-100-3/4
product price:  $249.99
/ea
Gems Sensors Flow Rate Monitor, Rotor, 20 GPM Max RFO, 155481
Gems Sensors

Flow Rate Monitor, Rotor, 20 GPM Max

Zoro # G2300925
Mfr # RFO, 155481
product price:  $176.99
/ea
Dwyer Instruments Sight flow indicator, 1" body, 4.375" L x 2.563" D x 2.625" H (111 x 65 x 67 mm), 2.7 lb (1.2 kg). SFI-100-1
Dwyer Instruments

Sight flow indicator, 1" body, 4.375" L x 2.563" D x 2.625" H (111 x 65 x 67 mm), 2.7 lb (1.2 kg).

Zoro # G5175073
Mfr # SFI-100-1
product price:  $291.99
/ea
Gems Sensors Flow Rate Monitor, Rotor, 5 GPM Max RFO, 155421
Gems Sensors

Flow Rate Monitor, Rotor, 5 GPM Max

Zoro # G2808312
Mfr # RFO, 155421
product price:  $178.99
/ea
Gems Sensors Flow Rate Indicator, Rotor, 20 GPM, 1/2 in. RFI, 155480
Gems Sensors

Flow Rate Indicator, Rotor, 20 GPM, 1/2 in.

Zoro # G2037016
Mfr # RFI, 155480
product price:  $94.49
/ea
Dwyer Instruments Sight flow indicator, 1" body, 4.375" L x 3.125" D x 2.563" H (111 x 79 x 65 mm), 3.0 lb (1.4 kg). SFI-300-1
Dwyer Instruments

Sight flow indicator, 1" body, 4.375" L x 3.125" D x 2.563" H (111 x 79 x 65 mm), 3.0 lb (1.4 kg).

Zoro # G5178442
Mfr # SFI-300-1
product price:  $343.99
/ea
Gems Sensors Flow Rate Indicator, Rotor, 5 GPM Max RFI, 155420
Gems Sensors

Flow Rate Indicator, Rotor, 5 GPM Max

Zoro # G0453083
Mfr # RFI, 155420
product price:  $92.19
/ea
Dwyer Instruments Sight flow indicator, 1/2" body, 4.000" L x 2.250" D x 2.563" H (102 x 57 x 65 mm), 1.5 lb (0.7 kg). SFI-100-1/2
Dwyer Instruments

Sight flow indicator, 1/2" body, 4.000" L x 2.250" D x 2.563" H (102 x 57 x 65 mm), 1.5 lb (0.7 kg).

Zoro # G5175082
Mfr # SFI-100-1/2
product price:  $251.99
/ea
Dwyer Instruments Sight flow indicator, 1-1/4" body, 4.375" L x 3.125" D x 2.563" H (111 x 79 x 65 mm), 3.0 lb (1.4 kg). SFI-300-1-1/4
Dwyer Instruments

Sight flow indicator, 1-1/4" body, 4.375" L x 3.125" D x 2.563" H (111 x 79 x 65 mm), 3.0 lb (1.4 kg).

Zoro # G7604712
Mfr # SFI-300-1-1/4
product price:  $357.99
/ea
J.W. Winco GN743.7-18-3/4-NPT-B Oil Sight Glass 11PTK7
J.W. Winco

GN743.7-18-3/4-NPT-B Oil Sight Glass

Zoro # G4667180
Mfr # 11PTK7
product price:  $21.65
/ea
Dwyer Instruments Sight flow indicator, 3/8" body, 3.000" L x 1.813" D x 2.125" H (76 x 46 x 54 mm), 1.1 lb (0.5 kg). SFI-100-3/8
Dwyer Instruments

Sight flow indicator, 3/8" body, 3.000" L x 1.813" D x 2.125" H (76 x 46 x 54 mm), 1.1 lb (0.5 kg).

Zoro # G7556342
Mfr # SFI-100-3/8
product price:  $223.99
/ea
J.W. Winco GN743.7-14-1/2-NPT-A Oil Sight Glass 8PTK1
J.W. Winco

GN743.7-14-1/2-NPT-A Oil Sight Glass

Zoro # G4712087
Mfr # 8PTK1
product price:  $17.59
/ea
Dwyer Instruments Sight flow indicator, 1-1/4" body, 4.375" L x 2.563" D x 2.625" H (111 x 65 x 67 mm), 2.7 lb (1.2 kg). SFI-100-1-1/4
Dwyer Instruments

Sight flow indicator, 1-1/4" body, 4.375" L x 2.563" D x 2.625" H (111 x 65 x 67 mm), 2.7 lb (1.2 kg).

Zoro # G5840247
Mfr # SFI-100-1-1/4
product price:  $318.99
/ea
Dwyer Instruments Sight flow indicator, 1/2" body, 4.063" L x 2.750" D x 2.563" H (103 x 70 x 65 mm), 2.6 lb (1.2 kg). SFI-300SS-1/2
Dwyer Instruments

Sight flow indicator, 1/2" body, 4.063" L x 2.750" D x 2.563" H (103 x 70 x 65 mm), 2.6 lb (1.2 kg).

Zoro # G5175091
Mfr # SFI-300SS-1/2
product price:  $477.99
/ea
Gems Sensors Flow Rate Indicator, Rotor, 30 GPM Max RFI, 180392
Gems Sensors

Flow Rate Indicator, Rotor, 30 GPM Max

Zoro # G1913301
Mfr # RFI, 180392
product price:  $215.99
/ea
Dwyer Instruments Sight flow indicator, 1" body, 4.375" L x 3.125" D x 2.563" H (111 x 79 x 65 mm), 3.0 lb (1.4 kg). SFI-300SS-1
Dwyer Instruments

Sight flow indicator, 1" body, 4.375" L x 3.125" D x 2.563" H (111 x 79 x 65 mm), 3.0 lb (1.4 kg).

Zoro # G7454727
Mfr # SFI-300SS-1
product price:  $618.99
/ea
Oil-Rite Fused Window Sights - 3/4in. NPTF, 1 1/16in., None, Not Applicable, 25/32in. A2890-4
Oil-Rite

Fused Window Sights - 3/4in. NPTF, 1 1/16in., None, Not Applicable, 25/32in.

Zoro # G916547375
Mfr # A2890-4
product price:  $7.19
/ea
Sold in mult. of 2 for $14.38
Gems Sensors Flow Rate Indicator, Rotor, 20 GPM Max RFI, 142542
Gems Sensors

Flow Rate Indicator, Rotor, 20 GPM Max

Zoro # G2866175
Mfr # RFI, 142542
product price:  $219.99
/ea
Dwyer Instruments Double Sight Flow Indicator, Brnz, 1-1/2In SFI-300-1-1/2
Dwyer Instruments

Double Sight Flow Indicator, Brnz, 1-1/2In

Zoro # G7569737
Mfr # SFI-300-1-1/2
product price:  $737.99
/ea
J.W. Winco GN743.7-18-3/4-NPT-A Oil Sight Glass 11PTK2
J.W. Winco

GN743.7-18-3/4-NPT-A Oil Sight Glass

Zoro # G4672570
Mfr # 11PTK2
product price:  $21.95
/ea
J.W. Winco GN743.7-14-1/2-NPT-B Oil Sight Glass 8PTK6
J.W. Winco

GN743.7-14-1/2-NPT-B Oil Sight Glass

Zoro # G4705297
Mfr # 8PTK6
product price:  $16.15
/ea
Gems Sensors Flow Rate Monitor, Rotor, 20 GPM Max RFO, 156262
Gems Sensors

Flow Rate Monitor, Rotor, 20 GPM Max

Zoro # G0994917
Mfr # RFO, 156262
product price:  $310.99
/ea
Gems Sensors Flow Rate Monitor, Rotor, 5 GPM Max RFO, 156261
Gems Sensors

Flow Rate Monitor, Rotor, 5 GPM Max

Zoro # G2649245
Mfr # RFO, 156261
product price:  $311.99
/ea
Dwyer Instruments Sight flow indicator, 3/4" body, 4.063" L x 2.750" D x 2.563" H (103 x 70 x 65 mm), 2.6 lb (1.2 kg). SFI-300SS-3/4
Dwyer Instruments

Sight flow indicator, 3/4" body, 4.063" L x 2.750" D x 2.563" H (103 x 70 x 65 mm), 2.6 lb (1.2 kg).

Zoro # G5175107
Mfr # SFI-300SS-3/4
product price:  $535.99
/ea
Gems Sensors Flow Rate Monitor, Rotor, 30 GPM Max RFO, 194761
Gems Sensors

Flow Rate Monitor, Rotor, 30 GPM Max

Zoro # G2644031
Mfr # RFO, 194761
product price:  $291.99
/ea
Gems Sensors Flow Rate Indicator, Rotor, 60 GPM Max RFI, 181681
Gems Sensors

Flow Rate Indicator, Rotor, 60 GPM Max

Zoro # G0674965
Mfr # RFI, 181681
product price:  $222.99
/ea
Oil-Rite Fused Window Sights - 1in. NPT, 1 3/8in., Stainless Steel, Aluminum Ball, 1in. A4959-1
Oil-Rite

Fused Window Sights - 1in. NPT, 1 3/8in., Stainless Steel, Aluminum Ball, 1in.

Zoro # G016547596
Mfr # A4959-1
product price:  $12.59
/ea
Dwyer Instruments Sight window, 2" male NPT. SFI-550-2
Dwyer Instruments

Sight window, 2" male NPT.

Zoro # G207149134
Mfr # SFI-550-2
product price:  $114.05
/ea
Conbraco WATER GAUGE WITH ROD&GLASS 21-205-00
Conbraco

WATER GAUGE WITH ROD&GLASS

Zoro # G609244604
Mfr # 21-205-00
product price:  $192.99
/ea
Dwyer Instruments Sight flow indicator, 1-1/4" body, 4.375" L x 3.125" D x 2.563" H (111 x 79 x 65 mm), 3.0 lb (1.4 kg). SFI-300SS-1-1/4
Dwyer Instruments

Sight flow indicator, 1-1/4" body, 4.375" L x 3.125" D x 2.563" H (111 x 79 x 65 mm), 3.0 lb (1.4 kg).

Zoro # G5697894
Mfr # SFI-300SS-1-1/4
product price:  $556.99
/ea
Dixon In-Line Sight Glass, Clamp, 2" B54BMP-R200
Dixon

In-Line Sight Glass, Clamp, 2"

Zoro # G7146889
Mfr # B54BMP-R200
product price:  $333.55
/ea
J.W. Winco GN743-32-M40X1.5-A Oil Sight Glass 743-32-M40X1.5-A
J.W. Winco

GN743-32-M40X1.5-A Oil Sight Glass

Zoro # G4720855
Mfr # 743-32-M40X1.5-A
product price:  $20.66
/ea
Dixon METAL BOWL W/SIGHT GLASS & MANUAL DRAIN FOR GRP-96-636
Dixon

METAL BOWL W/SIGHT GLASS & MANUAL DRAIN FOR

Zoro # G609195982
Mfr # GRP-96-636
product price:  $83.79
/ea
Dwyer Instruments GL FLMTR .5-5 SLMP DR12470M
Dwyer Instruments

GL FLMTR .5-5 SLMP

Zoro # G310113930
Mfr # DR12470M
product price:  $915.99
/ea
Dwyer Instruments Sight flow indicator, 2" body, 5.500" L x 3.688" D x 4.063" H (140 x 93 x 103 mm), 7.0 lb (3.2 kg). SFI-300SS-2
Dwyer Instruments

Sight flow indicator, 2" body, 5.500" L x 3.688" D x 4.063" H (140 x 93 x 103 mm), 7.0 lb (3.2 kg).

Zoro # G5613273
Mfr # SFI-300SS-2
product price:  $1,477.99
/ea
Dwyer Instruments Sight flow indicator, 1/4" body, 3.063" L x 2.250" D x 2.125" H (78 x 57 x 54 mm), 1.7 lb (0.8 kg). SFI-300-1/4
Dwyer Instruments

Sight flow indicator, 1/4" body, 3.063" L x 2.250" D x 2.125" H (78 x 57 x 54 mm), 1.7 lb (0.8 kg).

Zoro # G7493857
Mfr # SFI-300-1/4
product price:  $296.80
/ea
Sight Glass Flow Indicators (544 items)
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About Sight Glass Flow Indicators

Sight Glass Flow Indicators are a type of visual flow indicator used to measure the rate and direction of liquids, gases, and steam in pipes. They are a critical tool for many industries that rely on accurate measurements of flow in order to maintain safety and efficiency.

Types of Sight Glass Flow Indicators

There are several types of Sight Glass Flow Indicators commonly used today. Flanged sight glass flow indicators are often used when more accuracy is needed, while inline sight flow indicators are typically better suited for heavier duty applications. Oil flow sight glasses may be preferred for certain applications where viscosity is an issue. Water flow indicator sight glasses may also be necessary depending on the particular application.

How Sight Glass Flow Indicators are Made

Sight Glass Flow Indicators are typically made with high-quality glass and metal components. The glass allows professionals to visually inspect the contents inside the pipe while also allowing light to pass through so they can see what is happening inside the pipe. The metal components provide support and protection to ensure proper function over time.

Industries that use Sight Glass Flow Indicators

Sight Glass Flow Indicators can be found in a variety of industries, from plumbing and engineering to oil refining and chemical production. Professionals across these fields rely on these tools for their ability to accurately measure the rate, direction, temperature, pressure, and other characteristics related to liquid or gas flows.

Find the Sight Glass Flow Indicators You Need at Zoro

Looking for a specific item? Use our robust search tool to find it by name or keyword, or use our handy filters to narrow down our full assortment. You can also check out our whole selection of sight glass flow indicators, along with other tools or equipment to ensure you have all you need to tackle the job, especially if you're taking on a DIY project for the first time.

Plus, when you shop at Zoro, you'll always enjoy competitive prices on tons of great brands you know and trust. We make the shopping experience as fast and seamless as possible with free shipping on orders over $50 for registered users, Net 30 payment terms for qualifying customers, and an unparalleled customer service experience.

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