Experience unbeatable performance with ASCO Series 355 Joinable Subbases for Spool Valves Series 519. Made from a durable combination of glass-filled polyamide 6/6 (PA + FG) and polyether, these subbases offer strength and reliability for all your fluid control needs. The pressure indicator for ports 2 and 4, located on the flange, ensures optimal performance. Upgrade your system today with ASCO Series 355 Joinable Subbases.