Firestop Collar For 3" and 4" Trade Size Pipe and Corresponding Fittings

Reference#: 73431
Item#: RTC350


SpecSeal® Series RTC Range-Taking Firestop Collars are factory-manufactured devices designed to seal plastic pipes penetrating through fire resistance rated walls and floors. Spec-Seal® RTC Collars are comprised of a heavy gauge metal collar housing a molded intumescent insert. The adjustable collar is designed to allow a single collar to fit 3” and 4” trade size pipes (89 and 114 mm) and corresponding 3” and 4” couplings (102 and 127 mm). When exposed to temperatures in excess of 320°F (160°C), the SpecSeal® RTC Collar’s molded insert begins to expand (intumesce) rapidly to form a dense, highly insulative char. Free expansion ranges from 32 to 64 times original (pre-expanded) volume. Expansion continues up to 1,000°F (538°C).


  • Adjustable – one collar fits 3” and 4” pipes and corresponding couplings
  • Rapid expansion – closes off burning pipes quickly
  • Small profile – use it in all the tight spots!
  • Flexible and durable – no loose flakes (eye hazards)
  • Water-resistant – no water soluble or hygroscopic ingredients
  • Economical – lower installed cost
  • High volume char – expands up to 60 times!
  • Replaces traditional field-erected wrap strip/restraining collar systems for pipe couplings
  • Reduces inventory – one convenient product covers 3 and 4 in. trade size pipes. Use sealant for 2 in. and smaller trade size pipes!
  • Specification

  • Shell Construction: Nom 22 GA galvanized steel (0.03” thick (0.76 mm)
  • Intumescent Insert: Molded one piece
  • Sizes Accommodated:
    3” trade size pipe (89 mm)
    3” trade size pipe coupling (102 mm)
    4” trade size pipe (114 mm)
    4” trade size pipe coupling (127 mm)
  • Expansion Begins: 320°F (160°C)
  • Volume Expansion: 32x to 64x (free expansion)
  • In Service Temperature: ≤120˚ F (<49˚ C)