Spanner Wrench Deck Plate Key | GROCO SW-2531 Spanner Wrench Deck Plate Key Among the features of Groco ARG, SS, SD, and BVS series strainers are provisions on the strainer cap for the use of a spanner wrench to tighten or loosen the cap before or after maintenance Cast bronze with 1/4 in. and 5/16 in. stainless steel pins Opens to service deck plates or strainer caps with key holes up to 7 in. apart Hangs conveniently near the strainers location Replaces Groco SW 2531