Quick view Add to Cart Decrease in Outboard Relief Valve Pressure, Ref 537 Document Part Number: No. 118 Number of pages: 2Part Number: No. 118Revision Date: 14-Feb-1947Description: Ref 538 - Higher Pressure Auxiliary Check Valve Spring, Ref 539 - New Attaching Clamp for Electric Heads on Double-Acting... MSRP: Was: Now: $15.00