SPECIAL ORDER ITEM. Review Returns Policy before purchase. These stainless 304 fittings are designed to be used with off-the-shelf schedule 10 to schedule 40 stainless steel pipe to form a complete press system that is ideal for both commercial and industrial applications. stainless 304 fittings utilize a versatile FKM sealing element to provide a reliable, leak-free connection. This system can stand up to harsh environments while transporting process water, diesel fuel, lube oil, ammonia, low-pressure steam, or any number of other essential fluids or gases.