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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 5 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.

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:

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


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


Download Brochure

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Figure No. 2694 • Patent No. 9,708,808