Tube-Style Flow Sights | McMaster-Carr

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

NPTF

	For Use With For Use With

	Body Material Body Material

Polymethylpentene Plastic

	Connection Style Connection Style

Threaded

Quick Clamp

Barbed

	Maximum Pressure Maximum Pressure

	Connection Type Connection Type


Pipe	Tube

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

Any Position

	Indicator Type Indicator Type

No Indicator

Ball

Rotor

	For Minimum Tube ID For Minimum Tube ID

3/16"

1/4"

	Direction of Flow Direction of Flow

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	End-to-End Length End-to-End Length

	For Tube OD For Tube OD

1/2"

3/4"

1 1/2"

	Window Material Window Material

Glass

Plastic

	Window Length Window Length

	Gender Gender

Female

Male

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Window Type Window Type

Front and Back

Tubular

	Seal Material Seal Material

Buna-N Rubber

EPDM Rubber

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

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48 Products

Compact Flow Sights with Indicator for Water and Oil

For visual confirmation of flow from a distance, these sights have a ball indicator that moves when flow is present. They have a low-profile body for installation in pipelines with limited clearance. Backlight the back window to increase the visibility of dark liquids.

Sights with a 303 stainless steel body are more corrosion resistant than sights with a brass or zinc-plated steel body.

For technical drawings and 3-D models, click on a part number.

									Indicator
Pipe Size	Thread Type	Gender	Temp. Range, °F	Window Lg.	Hex Size	End-to-End Lg.	Max. Pressure	Direction of Flow	Material	Color		Each
Brass Body
1/8	NPTF	Female	-40° to 180°	1"	7/8"	3 1/4"	435 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	000000
1/4	NPTF	Female	-40° to 180°	1"	7/8"	3 1/2"	435 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
3/8	NPTF	Female	-40° to 180°	1 1/8"	1"	4 1/4"	425 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
1/2	NPTF	Female	-40° to 180°	1 1/4"	1 1/4"	4 5/8"	380 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
3/4	NPTF	Female	-40° to 180°	1 3/8"	1 3/8"	5 1/4"	345 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
1	NPTF	Female	-40° to 180°	1 1/2"	1 5/8"	6 1/4"	270 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	000000
Zinc-Plated Steel Body
1/8	NPT	Female	0° to 180°	1 1/16"	13/16"	3"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
1/4	NPT	Female	0° to 180°	1 1/16"	13/16"	3"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
3/8	NPT	Female	0° to 180°	1 3/8"	15/16"	4 1/8"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
1/2	NPT	Female	0° to 180°	1 3/8"	1 1/16"	5"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
3/4	NPT	Female	0° to 180°	1 1/2"	1 1/4"	5 5/8"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
303 Stainless Steel Body
1/8	NPT	Female	0° to 180°	1 1/16"	13/16"	3"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
1/4	NPT	Female	0° to 180°	1 1/16"	13/16"	3"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	00000
3/8	NPT	Female	0° to 180°	1 3/8"	15/16"	4 1/8"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	000000
1/2	NPT	Female	0° to 180°	1 5/16"	1 1/16"	5"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	000000
3/4	NPT	Female	0° to 180°	1 1/2"	1 1/4"	5 5/8"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	0000000	000000

Compact Flow Sights for Water and Oil

The low-profile body fits in areas with limited clearance. These sights let you visually confirm flow and inspect liquid color and clarity. The back window can be backlit to increase the visibility of dark liquids.

Sights with a 303 stainless steel body are more corrosion resistant than sights with a brass or zinc-plated steel body.

For technical drawings and 3-D models, click on a part number.

Brass Body
Pipe Size	Thread Type	Gender	Temp. Range, °F	Window Lg.	Hex Size	End-to-End Lg.	Max. Pressure	Direction of Flow		Each
1/8	NPTF	Female	-40° to 180°	1"	7/8"	3 1/4"	435 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	000000
1/4	NPTF	Female	-40° to 180°	1"	7/8"	3 1/2"	435 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
3/8	NPTF	Female	-40° to 180°	1 1/8"	1"	4 1/4"	425 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
1/2	NPTF	Female	-40° to 180°	1 1/4"	1 1/4"	4 5/8"	380 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
3/4	NPTF	Female	-40° to 180°	1 3/8"	1 3/8"	5 1/4"	345 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
1	NPTF	Female	-40° to 180°	1 1/2"	1 5/8"	6 1/4"	270 psi @ 150° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	000000
Zinc-Plated Steel Body
1/8	NPT	Female	0° to 180°	1 1/16"	13/16"	2 1/4"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
1/4	NPT	Female	0° to 180°	1 1/16"	13/16"	2 1/4"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
3/8	NPT	Female	0° to 180°	1 3/8"	15/16"	2 7/8"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
1/2	NPT	Female	0° to 180°	1 3/8"	1 1/16"	3 5/8"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
3/4	NPT	Female	0° to 180°	1 1/2"	1 1/4"	3 3/4"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
303 Stainless Steel Body
1/8	NPT	Female	0° to 180°	1 1/16"	13/16"	2 1/4"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
1/4	NPT	Female	0° to 180°	1 1/16"	13/16"	2 1/4"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
3/8	NPT	Female	0° to 180°	1 3/8"	15/16"	2 7/8"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
1/2	NPT	Female	0° to 180°	1 5/16"	1 1/16"	3 5/8"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000
3/4	NPT	Female	0° to 180°	1 1/2"	1 1/4"	3 3/4"	125 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	0000000	00000

Flow Sights with Barbed Fittings for Water, Oil, Air, and Inert Gas

Ball Indicator

Rotor Indicator

Monitor liquid movement, color, and clarity in tube systems—these sights have barbed fittings that slide into soft plastic and rubber tubing. They have a clear body and an indicator that moves when flow is present, so you can visually confirm flow from a distance.

						Indicator
For Tube ID	Temp. Range, °F	End-to-End Lg.	Ht.	Max. Pressure	Direction of Flow	Material	Color	For Use With		Each
Ball Indicator
Polycarbonate Plastic Body
1/4" to 3/8"	32° to 180°	3"	2 1/4"	10 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Nylon Plastic	White	Water, Oil, Air, Inert Gas	0000000	000000
Rotor Indicator
Polymethylpentene Plastic Body
1/4" to 7/16"	32° to 140°	3 1/2"	1 9/16"	20 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Polypropylene Plastic	Blue	Water, Mineral Oil, Air, Inert Gas	0000000	00000
Polystyrene Plastic Body
3/16" to 1/4"	0° to 190°	2"	1"	10 psi @ 70° F	Bottom to Top, Left to Right, Right to Left, Top to Bottom	Polystyrene Plastic	Blue	Water, Oil, Air, Inert Gas	0000000	00000

Compact Flow Sights for Chemicals

About half the height of other flow sights for chemicals, these fit in areas with limited clearance. They provide an unobstructed view of liquid color, clarity, and movement through the tubular window. For excellent chemical resistance, they have a 316 stainless steel body and an FEP window.

For technical drawings and 3-D models, click on a part number.

				Window
Pipe Size	Thread Type	Gender	Temp. Range, °F	Dia.	Lg.	End-to-End Lg.	Ht.	Max. Pressure	Direction of Flow		Each
316 Stainless Steel Body
1/2	NPT	Male	-100° to 250°	5/8"	4"	9"	1"	150 psi @ 70° F	Any Direction	0000000	0000000
1/2	NPT	Male	-100° to 250°	5/8"	6"	11"	1"	150 psi @ 70° F	Any Direction	0000000	000000
1/2	NPT	Male	-100° to 250°	5/8"	12"	17"	1"	150 psi @ 70° F	Any Direction	0000000	000000
1/2	NPT	Male	-100° to 250°	5/8"	24"	29"	1"	150 psi @ 70° F	Any Direction	0000000	000000
1	NPT	Male	-100° to 250°	1 1/4"	4"	10 1/4"	1 9/16"	150 psi @ 70° F	Any Direction	0000000	000000
1	NPT	Male	-100° to 250°	1 1/4"	6"	12 1/4"	1 9/16"	150 psi @ 70° F	Any Direction	0000000	000000
1	NPT	Male	-100° to 250°	1 1/4"	12"	18 1/4"	1 9/16"	150 psi @ 70° F	Any Direction	0000000	000000
1	NPT	Male	-100° to 250°	1 1/4"	24"	30 1/4"	1 9/16"	150 psi @ 70° F	Any Direction	0000000	000000

Flow Sights for Food and Beverage

Made of FDA-listed materials for use with food and beverage, these sights have sanitary quick-clamp connections and an electropolished 316 stainless steel body for easy disassembly and cleaning. They meet USP (United States Pharmacopeia) Class IV standard for food applications. Sights let you visually confirm flow and inspect liquid color and clarity. Backlight the back window to increase the visibility of dark liquids.

For technical drawings and 3-D models, click on a part number.

316 Stainless Steel Body
For Tube OD	Temp. Range, °F	Window Lg.	End-to-End Lg.	Ht.	Max. Pressure	Direction of Flow	Specifications Met		Each
1/2"	-20° to 300°	3/4"	3"	1/2"	150 psi @ 265° F	Any Direction	FDA Compliant 21 CFR 177.2600, USP Class IV	0000000	0000000
3/4"	-20° to 300°	1 1/8"	3 3/8"	3/4"	150 psi @ 265° F	Any Direction	FDA Compliant 21 CFR 177.2600, USP Class IV	0000000	000000
1"	-20° to 300°	1 1/8"	3 1/2"	1"	120 psi @ 265° F	Any Direction	FDA Compliant 21 CFR 177.2600, USP Class IV	0000000	000000
1 1/2"	-20° to 300°	1 1/2"	4 1/8"	1 1/2"	115 psi @ 265° F	Any Direction	FDA Compliant 21 CFR 177.2600, USP Class IV	0000000	000000
2"	-20° to 300°	1 7/8"	4 3/4"	2"	100 psi @ 265° F	Any Direction	FDA Compliant 21 CFR 177.2600, USP Class IV	0000000	000000