We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Clear polycarbonate spacer frame with conduit knockouts, surface mount base

Safety Technology International

Safety Technology International STI-3100 Pull Station Guard Spacer Polycarbonate

SKU CH-QXFZ-MDP39

A clear polycarbonate spacer that fits pull stations, call points and push buttons, accepting 1/2 in or 3/4 in rigid conduit with top and bottom knockouts for indoor surface mounting

  • TypeSurface Mount Base
  • Clear polycarbonate spacer protects pull stations from accidental activation
  • Surface-mount base with conduit knockouts simplifies indoor installation
  • cUL and UL listed for code-compliant safety applications
  • Accommodates both 1/2 in and 3/4 in rigid conduit for flexible wiring
  • Mounting hardware included for immediate setup

Product Identity

The Safety Technology International STI-3100 is a polycarbonate spacer designed for surface mounting pull stations, call points and push buttons. It suits installers who need a clear, rigid frame that fits standard conduit sizes on indoor walls.

Thermal Noise Power

The polycarbonate construction adds no active cooling, moving parts or electrical load to the circuit. It creates no audible noise and draws no power, leaving the thermal and acoustic profile of the connected device unchanged.

Accessory Impact

Included mounting hardware allows immediate installation without sourcing separate fasteners. Knockouts on the top and bottom accept both 1/2 in and 3/4 in rigid conduit, letting the installer route cable cleanly through the spacer frame.

Highlights

  • Clear polycarbonate spacer protects pull stations from accidental activation
  • Surface-mount base with conduit knockouts simplifies indoor installation
  • cUL and UL listed for code-compliant safety applications
  • Accommodates both 1/2 in and 3/4 in rigid conduit for flexible wiring
  • Mounting hardware included for immediate setup

Specifications

BrandSafety Technology International
ModelSTI-3100
TypeSurface Mount Base

Questions about this item

How do I install the STI-3100 spacer on a mounting surface and which conduit knockout size should I use?

Mount the clear polycarbonate frame to the surface using the included hardware, then select the 1/2 in or 3/4 in rigid conduit knockout on the top or bottom that matches your conduit size.

What maintenance will the polycarbonate spacer and its conduit knockouts require over time?

Inspect the clear polycarbonate frame periodically for cracks or UV discoloration and ensure the 1/2 in and 3/4 in conduit knockouts remain sealed against moisture ingress.

What is the first limitation that appears when the STI-3100 spacer is used continuously in an indoor environment?

The clear polycarbonate material may yellow or become brittle after prolonged exposure to indoor lighting and temperature cycles, reducing visibility and impact resistance.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.