Comparison : Item # H485SSN1/81/3PSI, H400 Series, SS Check Valve, 1/8” Male NPT Thread x 1/8” Female NPT Thread
Item # H485SSN1/41/3PSI, H400 Series, SS Check Valve, 1/4” Male NPT Thread x 1/4” Female NPT Thread
Item # H485SSR1/8, H400 Series, SS Check Valve, 1/8” Male BSPT Thread x 1/8” Female BSPT Thread
Item # H485SSR1/4, H400 Series, SS Check Valve, 1/4” Male BSPT Thread x 1/4” Female BSPT Thread
Item # H485BN1/8, H400 Series, Brass Check Valve, 1/8” Male NPT Thread x 1/8” Female NPT Thread