| Comparison : |
Item # 2-7821, Series 7821 2BUNA GRUVLOK CHECK VALVE
Item # 2-7811, Series 7811 2 EPDM GRVLK CHECK VALVE
Item # 2 1/2-7821, Series 7821 21/2 BUNA GRUVLOK CHECK VALVE
Item # 2 1/2-7811, Series 7811 21/2 EPDM GRV CHECK VALVE
Item # 3-7811, Series 7811 3 EPDM GRVLK CHECK VALVE
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