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This genuine Graco check valve, identified as Ref. 5 in the parts diagram (manual 306861), is a 1/2 NPT male-brass-end (MBE) stainless-steel (SST) valve with a Teflon (TF) seal. It is a direct replacement for the original component used in your Graco solvent valve assembly. Confirm your equipment matches the 501603 part number before ordering to ensure proper fit.