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The Trap-Defender is a pressure drop trap primer that releases water into the trap with any drop in pressure above 3 PSI. The Trap-Defender can be located in remote areas. It is superior to flow type trap primers in working with low flow fixtures and it also works with pressure spikes. The Trap-Defender comes with a 3 Year Warranty.

3 year warranty

Distribution Unit:

Jay R. Smith Mfg. Co.’s Trap-Defender is engineered to prime a single trap or multiple (4) traps with the use of a distribution unit (Fig. No. 294DA-ABS) designed to distribute water evenly between traps. The device should be located within 20’ of the floor drain trap. The trap primer valve shall be installed a minimum of 12” above the finished floor.

Optional Manual Priming Lever:

For periods of low water usage due to holidays or down periods, the Trap-Defender is equipped with a manual trap priming lever that allows maintenance to fill empty/low traps and clean/test the trap primer.

Three Available Finishes:

  • Brass (regularly furnished)
  • Chrome
  • Stainless Steel

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The Trap-Defender is ideal for use in commercial buildings.
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The Trap Defender:

  • Can prime up to four traps with the use of a distribution unit (Fig. No. 294DA-ABS)
  • Should be located within 20’ of the floor drain trap.
  • Should be installed a minimum of 12” above the finished floor.

Features and Benefits:

  • Fully automatic, no adjustments needed.
  • Operates at pressures from 20-80 PSI, with a minimum pressure drop of 3 PSI.
  • Does not require flow through the device in order to activate and can be mounted at the end of a water supply line branch pipe.
  • Produces output after an increase in supply line pressure due to water hammer effect.
  • Eliminates friction associated with pistons or o-rings, thus greatly increasing sensitivity..
  • Optional manual priming lever allows installers/maintenance to manually prime traps.
  • ASSE tested to 5000+ cycles
  • ASSE 1018 and cUPC listed


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oneRETAINER RING
twoFILTER SCREEN INSIDE INLET
threeANTI-OSCILLATION VALVE
fourTHREAD SIZE ½” NPTM
fiveTP UPPER BODY
sixDIAPHRAGM (RUBBER)
sevenCOMPRESSION ELEMENT (FOAM RING)
eightTRAP PRIMER VALVE
nineO-RING
tenTP LOWER BODY
elevenTHREAD SIZE ½” NPTF
twelveOPTIONAL MANUAL PRIMING LEVER
thirteenPRIMING PIN


Trap Defender

oneInitial inward flow when the water supply is opened.
twoThe Anti-Oscillation Valve's center orifice reduces inlet flow and delays the recompression of the foam ring for a fraction of a second, thus preventing trap primer oscillation due to water hammer effect. This valve allows ultralow pressure drop sensitivity in the trap primer valve design.
threeThe inlet check valve is open, allowing water to enter the lower chamber and compressing the foam ring’s internal gas bubbles.
fourLine pressure is holding the outlet valve seat closed.
fiveThe foam ring, being compressed by the inlet pressure, stores and equals this pressure information with no measurable difference between line pressure and the pressure of the foam ring, other than differential pressure. The capability of the foam to equal the line pressure allows constant and automatic adjustment to changes in static line pressure. No manual adjustment is required.
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Figure No. 2694 • Patent No. 9,708,808

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See the other trap primers in Smith’s product line and complement your trap primer installation with our accessory options.


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Trap-Defender™ Packaging

The Trap-DefenderTM comes boxed with 30 individually packaged units and provides a convenient way for wholesalers to purchase and stock the Trap-Defender product.


Trap Defender™ Literature