All Spulen couplers and reducers are made from a high quality reinforced 4 ply silicone. Spulen couplers are rigorously tested in both street and track environments and have been tested to over 60 psi of air pressure.

Specifications:

- 4 Ply Reinforced Silicone

- 4mm thick

- 2” (51mm) Inner Diameter to 2.5” (63mm) Inner Diameter

- 3” (76mm) Length