ASI Model 520 and 540, Semi-prep Head Piston Seal and Wash Seal. Spring is made of Hastelloy instead of 316 stainless steel. Hastelloy is an excellent material for a high temperature application and is also more chemical resistant.
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Piston Seal, Wash Seal with Hastelloy spring, UHMW-PE, ASI Model 520 and 540, Semi-prep Head