Threads are British Standard taper to IS07 and BS21.
All male threads are BSPT and female threads are BSPP. To EN 10226-1 and EN ISO 228-1
Whiteheart malleable cast iron EN-GJMW-400-5 to EN 1562
Suitable for the flow of water, steam, gas or other non aggressive media.
Two types are available:
With an anti-corrosive varnish to protect against rust after installation prior to plant conditioning.
Hot-dip zinc coated to give additional resistance to corrosion
GF291S-18N, GF291S-14N and GF291S-38N fittings are made of steel (galvanised finish - electro plated) and therefore unsuitable for potable water installations.