Test Gauges, Expansion Plugs, Caps & More

No plumber's tool box is complete without a complete selection of testing gauges, test plugs, test caps, and other testing equipment. PlumbingSupply.com® has the products you need at prices you can afford. Click here for many other plumbing-related tools we offer.
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Low Pressure Gas Test Manometer Gauge
Lazy Hand Water Test Gauge
Standard Water Test Gauge Kits
Air Test Gauge Kits
Inflatable Test Balls/Balloons/Plugs
Econo Test Plugs
Mechanical Test Plugs
Winterizing Expansion Plugs
Cleanout/Test Caps
Real-Tite Expansion Cleanout Plug

"Manometer" Gas Pressure Test Kit

Manometer kit
Features:
  • Check for pressure loss due to leaks or line restrictions
  • Comes in a durable hard plastic case
  • Usable for natural gas or LPG
  • 30" soft hose
  • Barbed (to fit manometer tubing) - includes 1/8" MIPS brass barbed adapter
  • Gauge displays 3 types of measurements including:
    • 0-20 oz per square inch (in 1 oz per square inch increments)
    • 0-35" of water column (in 1 inch of water column increments)
    • 0-8.6 kilopascals (in 0.1 kilopascal increments)
  • Great for testing:
    • Leaks in the installation
    • Regulator delivery pressure test
    • Regulator lock-up and leakage
Gas Pressure Test Kit - $63.64
Order 2, 6, or more of these test kits for greater savings!
Volume discounts will appear in your shopping cart.
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"Lazy Hand" Water Test Gauge

Lazy hand test gauge
Features:
  • High level indicator that remains at the highest pressure level until you reset it
  • Determines if you are getting pressure surges
  • Put it on a hose bibb and leave it on over night or for an extended period of time. The test gauge will then indicate the highest pressure that was reached during your absence.
  • Two different models available:
    • 0-160 PSI gauge readout
    • 0-300 PSI gauge readout
  • Attaches to 3/4" hose thread
  • Learn how the "lazy hand" test gauge operates
0-160 PSI "Lazy Hand" Water Test Gauge - $17.06
0-300 PSI "Lazy Hand" Water Test Gauge - $17.49
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Pro Tip: If you have excessive pressure, you may want to consider a pressure regulator.

Standard Water Test Gauge Kits

Water Test Gauge
Features:
  • Includes 3/4" female hose thread
  • These are not oil filled
  • Ships unassembled
  • Only need a pressure gauge? Buy them here
Model # Max PSI Price & Quantity
TWT030 30 PSI $14.90
TWT060 60 PSI $15.06
TWT100 100 PSI $15.00
TWT200 200 PSI $15.14
TWT300 300 PSI $13.22
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Air Test Gauge Kits

Gas Test Gauge complete with pipe adapter
Features:
  • Precision quality gauges
  • Includes 3/4" female pipe thread (FPT) adapter with 1/4" gauge port and 1/8" air valve port
  • Includes a Schrader-type valve to pressurize the line
  • 2" Gauge face
  • Complies with sec. 319.0 of UPC
  • Ships unassembled
  • Not for use on oxygen service
Model # Description Max PSI Price & Quantity
TGT015 1st pound in 1/5 PSI increments
1/10 PSI increments after 1st
15 PSI $13.43
TGT030 5 psi main increments 30 PSI $13.40
TGT060 10 psi main increments 60 PSI $13.27
TGT100 10 psi main increments 100 PSI $13.44
TGT200 20 psi main increments 200 PSI $15.04
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Inflatable Test Balls/Balloons/Plugs
10 PSI Maximum Pressure

2-inch inflatable test ball
Short Style without Hose
Model # Fits Pipe Size Price & Quantity
TTB075S 3/4" to 1-1/4" $40.49
TTB150S 1-1/4" to 1-1/2" $27.76
TTB200S 2" $29.78
TTB300S 3" $28.76
TTB400S 4" $37.40
TTB600S 6" $85.24
TTB800S 8" $134.01
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3-inch inflatable test ball
Long Style with 2' Extension Hose
Model # Fits Pipe Size Price & Quantity
TTB200L 2" $55.22
TTB300L 3" $73.00
TTB400L 4" $76.17
TTB600L 4" to 6" $163.02
1/4" Extension Air Hoses
TEH200 2 Feet Length $8.67
TEH300 3 Feet Length $9.61
TEH400 4 Feet Length $10.62
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Please Note: any brand of air inflated test balloons can be dangerous if not used per manufacturer instructions. Please also make sure when you use a test ball/plug, that you have a way of getting the water out of the pipe safely. So please plan ahead. Sticking your hand up a test tee to let the air out of a inflated test ball can cost you some fingers! Water pressure and air pressure can be dangerous for the unsuspecting. In our opinion inflatable test balls should have a chain tied to the pipe and an extension hose to let the air out slowly from a point where your fingers are safe. A test plug should be supported so that it won't slip out of the pipe under pressure.


Econo Test Plugs
aka Dollar Plug with Wing Nut

Test Plug
Features:
  • Designed with a rubber flange that grips the end of the pipe preventing slippage
  • 3" and 4" test plugs supplied with a superfly wingnut
  • For plastic, cast iron DWV
  • Use with caution if testing with air or other compressed gas
Model # Fits Pipe Size Price & Quantity
TDP100 1" $3.58
TDP125 1-1/4" $3.70
TDP150 1-1/2" $3.84
TDP200 2" $4.66
TDP300 3"
Super Wing Nut
$6.88
TDP400 4"
Super Wing Nut
$7.97
TDP600 6" $14.48
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Kwik 'N Sure Mechanical Test Plugs

Mechanical Plug
Features:
  • Works on all types of pipe including PVC, ABS, copper, galvanized etc.
  • Wing nut on 3/8" - 1-1/4" sizes
  • Hex nut on 1-1/2" through 5" sizes
  • Works well for plugging water line stub-outs
  • Natural rubber O-ring
  • Use with caution if testing with air or other compressed gas
With Wing Nut
Model # Fits Pipe Size Price & Quantity
TMP039 (.39") 3/8" $3.77
TMP050 1/2" $3.46
TMP075 3/4" $4.74
TMP100 1" $4.21
TMP125 1-1/4" $5.57
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With HEX Nut
Model # Fits Pipe Size Price & Quantity
TMP150 1-1/2" $7.60
TMP200 2" $10.59
TMP250 2-1/2" $14.47
TMP300 3" $16.72
TMP400 4" $26.45
TMP500 5" $35.05
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Winterizing Expansion Plugs

Winterizing Plug
Features:
  • Safely seals inlet and outlets against freezing
  • Stainless steel screw and washers
  • Nylon wing nut provides easier turning in cold temperatures, providing greater tightness than conventional plugs
  • Tapered for a better fit
  • Use with caution if testing with air or other compressed gas
Model # Size Price & Quantity
TWP075P 3/4" to 1" Pipe $1.80
TWP100P 1" Pipe $1.85
TWP100F 1" Fitting $3.42
TWP125P 1-1/4" Pipe $2.50
TWP125F 1-1/4" Fitting to 1-1/2" Pipe $2.98
TWP150P 1-1/2" Pipe $2.89
TWP150F 1-1/2" Fitting $3.06
TWP200P 2" Pipe $4.42
TWP200F 2" Fitting $4.59
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Threaded Winterizing Plugs with O-Ring

Winterizing threaded plug with o-ring
Features:
  • Safely seals swimming pool inlets and outlets against freezing
  • A temporary plug for any water system application
  • Used for either pipe or fittings
  • Heavy duty, white ABS construction
  • EPMD O-ring is resistant to extreme weather & chemical corrosion
  • Gives a positive seal - no leaking
  • Available in raised or flush style
  • 1-1/2" MIPS
Threaded FLUSH Winterizing Plug with O-Ring - $3.40
Threaded RAISED Winterizing Plug with O-Ring - $3.44
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Cleanout / Test Caps

Cleanout Cap
Features:
  • Also Known As "Jim Caps, Jimmy Caps or Cookies"
  • Temporarily or permanently cap drainage pipe
  • Made from durable flexible pvc material
  • Stainless steel band & clamp
  • Can be used above ground or underground
  • Tighten clamp to 60" lbs of torque
  • Fits over Cast Iron, Steel, or Sch. 40 Plastic pipe ends
Model # Steel/Cast Iron/Sch.40
Pipe Size
Fits Outside Diameter
Pipe Range
Price & Quantity
Minimum Maximum
TCC150 1-1/2" 1-5/8" 1-15/16" $4.92
TCC200 2" 1-15/16" 2-15/32" $5.66
TCC300 3" 3-1/16" 3-5/8" $7.02
TCC400 4" 3-15/16" 4-5/8" $9.22
TCC500 5" 5-1/32" 5-7/8" $11.81
TCC600 6" 5-3/4" 6-5/8" $11.65
TCC700 7" 6-7/16" 7-1/4" $17.27
TCC800 8" 7-11/16" 8-7/8" $25.88
TCC110 10" 9-7/8" 11" $38.25
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Real-Tite® Reusable Expansion Test Plugs / Covers

reusable expansion cleanout cover
Features:
  • Reusable, code approved, expansion plug for flush wall or floor finish
  • Seals plastic or metal, threaded or unthreaded
  • Dependable tight seal even when threads are bad or no longer exist
  • Seals virtually any opening permanently or temporarily
  • Easily tightened or removed with a 5/32" allen wrench (not included)
  • 2 sealing ridges, 3 embedded o-rings and a 3/16" neoprene gasket expand to create positive pressure seal
  • Moisture prevented from touching the nut or stainless steel bolt
  • Quick and easy removal ensured even after installed for long lengths of time
  • Stainless steel models have 10 gauge tops that won't easily ripple under extreme weight - perfect for heavy foot or machinery traffic areas
  • Fits inside a fitting or inside pipe
With ABS Top
Fits Size Untightened Diameter Tightened Diameter Price & Quantity
1-1/2" 1-5/8" 1-15/16" $13.61
2" 2-1/16" 2-5/16" $14.50
2-1/2" 2-3/4" 3-1/4" $15.77
3" 3-1/16" 3-1/2" $16.51
3-1/2" 3-7/8" 4-1/8" $16.83
4" 4-1/4" 4-5/8" $17.16
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With Stainless Steel Top
Fits Size Untightened Diameter Tightened Diameter Price & Quantity
1-1/2" 1-5/8" 1-15/16" $28.14
2" 2-1/16" 2-5/16" $29.64
2-1/2" 2-3/4" 3-1/4" $33.50
3" 3-1/16" 3-1/2" $39.03
3-1/2" 3-7/8" 4-1/8" $42.54
4" 4-1/4" 4-5/8" $44.00
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Special Real-Tite® Expansion Sleeves
Size Description Price & Quantity
3-1/2" Real-Tite Plug EXPANSION Sleeve
- view dimensions
$17.77
4" Real-Tite Plug EXPANSION Sleeve
- view dimensions
$18.04
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Related Items & Accessories


Frequently Asked Questions

Q. "How does the Lazy-Hand Water Test Gauge work?"
A. Install the gauge on a hose bibb and leave for as long as you'd like. One needle of the gauge will read the current pressure. The second needle is the "lazy hand" which will need to be adjusted by moving the knob on the front of the unit. Adjust the "lazy hand" to where the pressure currently is showing on the gauge. Over night or over time, the "lazy hand" will be moved by the needle reading the pressure when there is an increase in pressure. If the pressure is decreased, the lazy hand will stay where the peak pressure occurred. The "lazy hand" will stay at that peak reading until you manually reset it.

Q. "I have heard using mechanical plugs can be dangerous. Is this true?"
A. YES! EXTREME CAUTION must be taken when using mechanical plugs! Plugs used in conditions under back-pressure with a compressible media, such as air, can cause severe bodily injury or death may occur if the plug slips or fails for any reason. PEOPLE MUST STAND CLEAR while in use. Install only in a clean dry pipe. Failure to heed these warnings may result in serious bodily injury or death. Consult a professional engineer to determine how to safely block mechanical plugs when using air as a test media.
mechanical plug safety diagram


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