1.for PSV Valves. 2. Includes twelve (12) cover o-rings and twenty-four (24) stem o-rings. Cover O-rings go by part numbers 1132, 1132+, or 51016200. Stem o-rings go by part numbers R0487100 or 192039. 3. Compatible with Valves 1154, 1157, 2716, 2717, 2724, 2875, 2876, 4715, 4716, 4717, and 4724. 4. Compatible with Valves 51016200 and 192039. 5. Compatible with Valves PSV2S, PSV2S2, PSV3S, PSV3S2, PSV3SM, PSV2SDGR, PSV2S2DGR, PSV3SDGR, PSV3S2DGR, and PSV3SMDGR. Color: Black Material: rubber Package Contents: 12 x cover o-rings 24 x stem o-rings Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.