Frequently asked questions about the Fittings category
Fittings — what exactly are they?
Fittings are pipeline components: reducers, tees, elbows, caps and nipples used to change direction, diameter or connect valves and accessories; commonly made from brass, steel, PPR or PEX-AL-PEX and designed to meet industry standards.
Fittings GOST — which standards apply?
Fittings follow material-specific standards: steel and brass fittings have metalwork standards, while PPR and PEX‑AL‑PEX follow polymer/laminate specifications. Check product markings and certificates for compliance.
Valves and fittings — how do they differ and how to ensure compatibility?
Valves control flow while fittings change direction or diameter. Ensure compatibility by matching connection types (compression 12 mm, press 16/20/25 mm, threaded 1/2") and using compatible materials like brass, copper, PPR or PEX‑AL‑PEX.
What is included in fittings — main product list?
Includes tees, elbows, reducers, nipples, end caps, couplings, threaded adapters and press/compression fittings for PEX‑AL‑PEX and PPR. Also seals and compression rings, e.g. copper pipe ring 12 mm.
How to choose fittings by material: brass, steel, PPR, PEX‑AL‑PEX?
Brass is ideal for threaded joints and valves; steel for high‑pressure mains; PPR for hot water and chemically neutral media; PEX‑AL‑PEX for flexible heating circuits. Consider operating temperature, pressure and corrosion resistance.
What connection types exist — press, compression, threaded — which to choose?
Press fittings (16/20/25 mm) are fast and solder-free; compression suits copper pipes (compression ring 12 mm); threaded (1/2", 3/4") allow removable joints. Choose based on pipe material and installer skill.
How to determine correct fitting size for pipes (diameters and connections)?
Check the pipe's inner/outer diameter and connection type: PEX‑AL‑PEX sizes use mm (16, 20, 25), threaded use inches (1/2, 3/4). Product descriptions list exact sizes and connection type.
Which fittings are suitable for heating systems and underfloor heating?
Use PEX‑AL‑PEX pipes and press fittings (16–25 mm), tees and reducers for distribution, plus press seals (PRESS KUMMITIHEND) for leak‑proof joints. Choose items rated for system temperature and pressure.
Can fittings of different materials be combined (brass with PEX‑AL‑PEX etc.)?
Yes, but use proper adapters like a PPR Transition VK 20x3/4 or brass coupling. Ensure correct seals and consider corrosion and thermal expansion differences.
What accessories are required for installing fittings (seals, compression rings, press sleeves)?
Common accessories: PRESS KUMMITIHEND seals for PEX‑AL‑PEX, compression rings for copper (12 mm), press sleeves and adapters. Product descriptions state included parts and required seals.