The GFB recirculating hose plug is sized for 38 mm internal diameter hoses and is intended for use where a recirculating solution is required. It provides a clean, secure plug for 38 mm hoses on systems that use recirculation rather than atmospheric venting, helping retain charged airflow paths in compatible forced-induction plumbing.
GFB Recirculating Hose Plug - 38mm ID Hose