TuoLauthon Silicone Reducer Coupler 4" to 5" Straight 4‑Ply 5mm Wall with 2 Stainless Clamps

TuoLauthon’s 4" to 5" straight silicone reducer coupler is a heavy-duty, 4-ply silicone hose that joins 4-inch and 5-inch ducts or pipes reliably while resisting heat, UV and ozone.

This reducer coupler is engineered for mechanics, marine technicians, fabricators and DIY installers who need a short, robust connection between mismatched hose diameters. Constructed from 4-ply silicone with a 5 mm wall thickness, the piece ships with two stainless-steel clamps and fits inner diameters from 102 mm (4") to 127 mm (5"). It tolerates wide temperatures and pressures, making it suitable for automotive intake systems, coolant lines, exhaust pre-connections, or industrial ventilation where flexibility and durability matter.

How does this reducer handle different temperatures and environments?

The TuoLauthon reducer is formulated to remain stable across extreme temperatures and resist environmental degradation. Its silicone composition withstands cold and heat and resists ozone and UV exposure, which reduces cracking and hardening over time.

• Working range: -76°F (-60°C) to +500°F (+260°C)
• UV and ozone resistant for outdoor or marine use
• Suitable for long-term repeated thermal cycles without losing flexibility

What size and fit details should I know before buying?

The coupler adapts a 4" inner diameter to a 5" inner diameter on a short straight sleeve. Measure the outside diameter of your pipes or the inner diameter of hoses to ensure a snug fit; the included clamps tighten for a secure seal.

• Inner diameters accommodated: 102 mm (4") and 127 mm (5")
• Length: 76 mm; thickness: 5 mm for dependable sealing
• Includes two stainless-steel hose clamps for immediate installation

How strong and pressure-rated is this silicone coupler?

The 4-ply construction gives solid mechanical strength and pressure resistance for many non-critical fluid and air applications. Rated values provide guidance for safe operating ranges in typical automotive and light-industrial systems.

• Working pressure range: 0.3 MPa (43.5 PSI) to 0.9 MPa (130.5 PSI)
• Bursting pressure: up to 2 MPa for short-duration events
• Four reinforced plies reduce the chance of collapse under vacuum or deformation under pressure

Can I use this coupler for marine, automotive, or industrial projects?

Yes—this coupler’s materials and construction make it versatile for marine engine routing, automotive intake or coolant adaptations, and many industrial ducts. The stainless clamps and silicone that resists salt air and ozone improve its suitability for outdoor and marine settings.

• Common uses: intake piping, charge-air adaptors, coolant bypasses, vent and duct joins
• Material resists salt air corrosion and ozone for marine applications
• Short length works where space is limited or where a compact transition is needed

Who is this for? Installers, mechanics, boat owners and fabricators who need a compact, durable transition between 4" and 5" hoses or pipes will find this TuoLauthon reducer useful. It’s aimed at projects that demand temperature tolerance, UV/ozone resistance and a mechanically robust connection—perfect when you need a quick, dependable join with included stainless clamps.