Non Metallic Check Valves

Non-Metallic Check Valves Aeration » Airline Fittings & Valves » These polymer check valves have no springs. Use for fresh water, salt water or air. Make excellent foot valves with low pressure loss. 1/2 lb stainless steel springs (about 20" H2O resistance) available for more positive closure for 25¢ more per valve. Made in USA.