These Seacocks are designed for thru-hull applications. The MF 849 Flanged Seacock Series has NPT straight threads at each end, and is designed to be fitted with straight thread thru-hull fittings and straight thread tail pieces. Pipe joint compound or teflon tape is required to create a perfect seal.

These seacock assemblies are made of exceptionally strong, fiberglass-reinforced Marelon. Marelon is both electrically and chemically inactive - making for easy installation, very low maintenance, and long service life for the end user, without the worry of possible corrosion over time. It is very light weight, has exceptional UV resistance, and will not freeze or become brittle with age.
Marelon exceeds ISO standards, is approved by the ABYC, and passes the same stringent Marine UL tests as bronze.

Lightweight, yet extremely strong injection-molded parts
For use above or below the waterline
NPT parallel (straight) threads
Completely free from electrolysis or reaction to any metals - no electrical bonding required
Completely free from any corrosion
Minimal maintenance requirements - requires periodic lubrication
Accepts adhesives and coatings (bottom paint) easily
Can be used on aluminum, steel, wood, or fiberglass hulls
Can be used with metal fittings
Long term reliability