Gast K294H service kit used on oil-less diaphragm models with internal filtration (i.e. DOA-P701-AA). Service kit returns your unit to original factory performance specifications. Recommend for service every 2 years. 1 kit required for DOA models. 2 kits required for DAA models. Service kit includes: Leaf valve, limiters, o-ring, gasket, & filter/muffler elements.
Also recommended for replacement: AF818A (used on pressure models) or AF818B (used on vacuum models).