Pentek (143339) Head Nut Gasket Kit for ST-1, ST-2, and ST-3 PUMP ACCESSORIES Air gap models include three-line

Air gap models include three-line configuration with tank inlet

Each sachet contains high-purity potassium chloride solution standardized against NIST-traceable conductivity standards

Full sink coverage

Chemical exposure and wear can degrade the silicone over time

Use this standard when measuring boiler feedwater

Pentek (143339) Head Nut Gasket Kit for ST-1, ST-2, and ST-3 PUMP ACCESSORIES Air gap models include three-linePentek Replacement Parts Pentek 143339 Head Nut Gasket Kit Genuine OEM gasket kit engineered for ST 1, ST 2, and ST 3 stainless steel filter housings Prevents leaks and system failures Maintains cap integrity Genuine Pentek OEM The Pentek 143339 gasket kit is manufactured to exact specifications for the ST series stainless steel housings. Regular replacement of these critical seals prevents unexpected shutdowns and maintains consistent water flow.