Hydronic & Steam Sight Glasses

Hydronic & Steam Sight Glasses provide essential visual monitoring of water levels in steam boilers and hydronic systems for safe operation. These clear gauge glasses let you instantly check fluid conditions and prevent dangerous low-water situations that could damage equipment. Jackson Systems stocks sight glasses in multiple materials and sizes to fit your steam system needs perfectly.

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Showing 1–48 of 104 resultsSorted by popularity

1/2″ Bronze Water Gauge

Conbraco Industries

SKU: 20-250-03
$167.81
MSRP: $192.98
You save 15%
Conbraco 20-250-03 1/2" Bronze Water Gauge quantity
1/2″ NPT Rough Bronze Water Gauge with Automatic Ball Checks

Conbraco Industries

SKU: 20-350-00
$249.40
MSRP: $286.81
You save 15%
Conbraco Industries 20-350-00 1/2" NPT Rough Bronze Water Gauge w/ Ball Checks quantity
Sight Glass Kit for Boiler & Hydronic Systems

Lochinvar & A.O. Smith

SKU: 100311165
$143.84
MSRP: $165.42
You save 15%
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Sight Glass Assembly for HTP Boiler Systems

HTP

SKU: 7855P-401
$20.54
MSRP: $23.62
You save 15%
HTP 7855P-401 Sight Glass Assembly quantity
Water Gauge Glass Cocks, 1/2″ NPT Male Inlet, Set of 2

Weil McLain

SKU: 510-218-145
$128.39
MSRP: $147.65
You save 15%
Weil McLain 510-218-145 Water Gauge Glass Cocks 1/2" NPT Male Inlet, Set of 2 quantity
5/8″ OD Red Line Gauge Glass, 12″ Length – 12-Pack

Auburn

SKU: H4-12-12PK
$300.98
MSRP: $346.13
You save 15%
Auburn H4-12-12PK 5/8" OD Red Line Gauge Glass 12" – 12-Pack quantity
Liquid Level Sight Housing, 200 lb Pressure Rated

Trane

SKU: HUS3777
$201.49
MSRP: $231.71
You save 15%
Trane HUS3777 Liquid Level Sight Housing 200 lb Rated quantity
Tridicator Gauge 30-240°F / 0-75 PSI Rear Mount

Trerice

SKU: PTC14601
$48.38
MSRP: $55.64
You save 15%
Trerice PTC14601 Tridicator Gauge 30-240°F / 0-75 PSI Rear Mount quantity
Tridicator Thermometer/Gauge 30-240°F, 0-200 PSI

Trerice

SKU: PTC14405
$80.43
MSRP: $92.49
You save 15%
Trerice PTC14405 Tridicator Thermometer/Gauge 30-240°F 0-200 PSI quantity
Tridicator, 60-320°F Temp, 0-75 PSI Pressure, 1/4″ NPT

Trerice

SKU: PTC14007
$34.58
MSRP: $39.77
You save 13%
Trerice PTC14007 Tridicator, 60-320°F, 0-75 PSI, 1/4" NPT quantity
11″ Glass Water Gauge Set for Boiler Systems

Utica-Dunkirk

SKU: 14622005
$90.89
MSRP: $104.52
You save 15%
Utica-Dunkirk 14622005 11" Glass Water Gauge Set quantity
Tridicator Gauge, 320°F, 200 PSI, 1/2″ Connection

Raypak

SKU: 014647F
$123.43
MSRP: $141.94
You save 15%
Raypak 014647F Tridicator, 320°F, 200 PSI, 1/2" Connection quantity
Howe Temperature-Pressure Gauge for Peerless Boilers

Peerless Boiler

SKU: 51324
$73.34
MSRP: $84.34
You save 15%
Peerless Boiler 51324 Howe Temperature-Pressure Gauge quantity
7-1/4″ Glass Valve-Rod Water Gauge

Peerless Boiler

SKU: 50513
$207.65
MSRP: $238.80
You save 13%
Peerless Boiler 50513 7-1/4" Glass Valve-Rod Water Gauge quantity
Sight Glass Assembly for NTI Boilers

NTI Boiler

SKU: 6000085641
$153.36
MSRP: $176.36
You save 15%
NTI Boiler 6000085641 Sight Glass Assembly quantity
3/4″ EPDM Gasket Sight Glass for Hydronic & Steam Systems

Mars

SKU: 43305
$3.69
MSRP: $4.24
You save 15%
Mars 43305 3/4" EPDM Gasket Sight Glass quantity
1/2″ NPT Rough Bronze Water Gauge, 5/8″ OD x 12″ Glass, 125 PSI

Maxon

SKU: 42148
$144.74
MSRP: $166.45
You save 15%
Maxon 42148 1/2" NPT Rough Bronze Water Gauge, 5/8" OD x 12" Glass, 125 PSI @ 350°F quantity
Sight Glass Fiber Gasket, OEM Replacement Part

Lochinvar & A.O. Smith

SKU: 100274752
$12.44
MSRP: $14.31
You save 15%
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Sight Glass Gasket, OEM Replacement Part

Lochinvar & A.O. Smith

SKU: 100208762
$22.41
MSRP: $25.77
You save 15%
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Sight Glass Replacement Part, SKU 100208332

Lochinvar & A.O. Smith

SKU: 100208332
$39.30
MSRP: $45.20
You save 15%
Lochinvar & A.O. Smith 100208332 Sight Glass quantity
SightGlass Kit for Boiler & Hydronic Systems

Lochinvar & A.O. Smith

SKU: 100189215
$44.81
MSRP: $51.53
You save 15%
Lochinvar & A.O. Smith 100189215 SightGlass Kit quantity
Sight Glass Kit for Boiler & Hydronic Systems

Lochinvar & A.O. Smith

SKU: 100163259
$70.56
MSRP: $81.14
You save 15%
Lochinvar & A.O. Smith 100163259 Sight Glass Kit quantity
Sight Glass Kit for Lochinvar & A.O. Smith Equipment

Lochinvar & A.O. Smith

SKU: 100163249
$144.89
MSRP: $166.62
You save 15%
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Sight Glass Gasket Kit for Boiler Maintenance

Lochinvar & A.O. Smith

SKU: 100163214
$65.02
MSRP: $74.77
You save 15%
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Oil Indicator with Valve for Reliable System Monitoring

Johnson Controls

SKU: A-4000-120
$175.91
MSRP: $202.30
You save 15%
Johnson Controls A-4000-120 Oil Indicator with Valve quantity
Sight Glass for Hydrotherm Boiler Systems

Hydrotherm

SKU: 60-4280
$15.10
MSRP: $17.37
You save 15%
Hydrotherm 60-4280 Sight Glass quantity
Gasket/View Glass Replacement Part

Hydrotherm

SKU: 05-00103-001
$15.10
MSRP: $17.37
You save 15%
Hydrotherm 05-00103-001 Gasket/View Glass quantity
8-3/8″ XH Redline Gauge Glass Replacement

Fujitsu

SKU: 2-12-000065
$119.00
MSRP: $136.85
You save 15%
Fujitsu 2-12-000065 8-3/8" XH Redline Gauge Glass quantity
Window Plug Sight Glass for Power Flame Burners

Power Flame Burners

SKU: 931243
$5.66
MSRP: $6.51
You save 15%
Power Flame Burners 931243 Window Plug Sight Glass quantity
Sight Flow Indicator, 3/4″ Body, Double Window, 200°F Limit

Dwyer

SKU: SFI-300-3/4
$339.43
MSRP: $390.34
You save 15%
Dwyer SFI-300-3/4 Sight Flow Indicator, 3/4" Body, Double Window quantity
Sight Flow Indicator, 1/2″ Body, Tempered Glass Window, 200°F Limit

Dwyer

SKU: SFI-100-1/2
$249.42
MSRP: $286.83
You save 15%
Dwyer SFI-100-1/2 Sight Flow Indicator, 1/2" Body, Tempered Glass Window quantity
Gauge Glass Assembly for Utica-Dunkirk Boilers

Utica-Dunkirk

SKU: GA-004.00
$98.53
MSRP: $113.31
You save 13%
Utica-Dunkirk GA-004.00 Gauge Glass Assembly quantity
Hydronic Boiler Sight Glass, OEM Replacement Part

Weil McLain

SKU: 591-419-199
$85.21
MSRP: $97.99
You save 13%
Weil McLain 591-419-199 Hydronic Boiler Sight Glass quantity
Water Gauge Glass Guard, 3/16″ Dia. x 12-1/2″ Long, 2 Per Pack

Weil McLain

SKU: 563-334-595
$13.84
MSRP: $15.92
You save 15%
Weil McLain 563-334-595 Water Gauge Glass Guard, 3/16" x 12-1/2", 2-Pack quantity
Inspection Glass Assembly for ECO & WM97+ Boilers

Weil McLain

SKU: 383-700-185
$71.58
MSRP: $82.32
You save 15%
Weil McLain 383-700-185 Inspection Glass Assembly ECO/WM97+ quantity
Water Gauge Glass Kit, 5/8″ x 10 5/8″, With Gaskets & Brass Washers

Weil McLain

SKU: 383-600-002
$111.34
MSRP: $128.04
You save 15%
Weil McLain 383-600-002 Water Gauge Glass Kit 5/8" x 10 5/8" w/ Gaskets quantity
Gauge Glass Water Kit, 5/8″ x 8-5/8″

Weil McLain

SKU: 383-600-001
$226.00
MSRP: $259.90
You save 15%
Weil McLain 383-600-001 Gauge Glass Water Kit 5/8 x 8-5/8 quantity
Water Gauge Glass Kit 5/8″ x 7 3/8″ with Gaskets & Brass Washers

Weil McLain

SKU: 383-600-000
$94.30
MSRP: $108.45
You save 15%
Weil McLain 383-600-000 Water Gauge Glass Kit 5/8" x 7 3/8" w/ Gaskets quantity
Inspection Glass Kit w/ Bracket, Glass, Gasket & Hardware

Weil McLain

SKU: 383-500-020
$49.99
MSRP: $57.49
You save 15%
Weil McLain 383-500-020 Inspection Glass Kit w/ Bracket, Glass, Gasket & Hardware quantity
Boiler Observation Port for Weil McLain Systems

Weil McLain

SKU: 340-004-605
$134.76
MSRP: $154.97
You save 15%
Weil McLain 340-004-605 Boiler Observation Port quantity
Remote Mount Liquid Level Control, NEMA 4X Enclosure, 4-Probe

McDonnell & Miller

SKU: 750B-C-4
$908.09
MSRP: $1,044.30
You save 15%
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Remote Mount Liquid Level Control, NEMA 4X, 3 Probes

McDonnell & Miller

SKU: 750B-C-3
$808.09
MSRP: $929.30
You save 15%
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Gauge Glass Valve Set for Boiler & Hydronic Systems

Crown Engineering

SKU: H7-12
$83.81
MSRP: $96.38
You save 15%
Crown Engineering H7-12 Gauge Glass Valve Set quantity
Packing Nut Kit for 5/8″ Diameter Sight Glass

Crown Engineering

SKU: 70322
$8.44
MSRP: $9.71
You save 15%
Crown Engineering 70322 Packing Nut Kit 5/8 Dia Glass quantity
5/8″ x 12″ Regular Sight Glass for Hydronic & Steam Systems

Conbraco Industries

SKU: 9858R-12
$18.58
MSRP: $21.37
You save 13%
Conbraco Industries 9858R-12 5/8" x 12" Regular Sight Glass quantity
Redline Boiler Sight Glass, 36″, 5/8″ Diameter

Conbraco Industries

SKU: 9858P-36
$261.04
MSRP: $300.20
You save 15%
Conbraco Industries 9858P-36 Redline Boiler Sight Glass, 36", 5/8" Dia. quantity
1/2″ NPT Polished Bronze Water Gauge Valve w/ Ball Checks

Conbraco Industries

SKU: 25-502-03
$319.61
MSRP: $367.55
You save 15%
Conbraco Industries 25-502-03 1/2" NPT Polished Bronze Water Gauge Valve quantity
1/2″ NPT Polished Bronze Water Gauge Valve, 200 PSI @ 400°F

Conbraco Industries

SKU: 25-501-03
$325.70
MSRP: $374.56
You save 13%
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