Spare O Rings set item no. 4, 5, 23 27 for Relief Valve, Make, Forbes Marshall, Model No., VSR2. 300. 25A40. I. 26. 100. 102. 123, Serial No. FSM0189., One set consists of four O Rings., Spare disc item no. 8 for, Relief Valve, Make Forbes Marshall, Spare Ball item no. 13 for Relief Valve, Make Forbes, Marshall, Model No. VSR2. 300. 25A40. I. 26. 100. 102. 123, Serial No. FSM0189., Spare gasket item no. 12 for Relief, Valve, Spare Spring item no. 20 along with spring guides item no., 18 22 for Relief Valve, Serial No. FSM0189, Spare spindle item no. 21 for Relief Valve