Fittings — Expansion joints
Expansion joints
Product families of expansion joints in grades SS304 and SS316L.
Frequently asked questions — Expansion joints
What materials are TAVINOX GROOVE expansion joints made of?
Each family is made in one stainless steel grade: AISI 304 (1.4301) — KP60GRGR; AISI 316L (1.4404) — KP10GRGR.
What sizes are TAVINOX GROOVE expansion joints made in?
10 variants in 2 families for DN125, DN150, DN200, DN250 and DN300 (outside diameter 133, 159, 219, 273 and 323.9 mm).
What is the nominal pressure of TAVINOX GROOVE expansion joints?
Nominal pressure 1.6 MPa (PN 16); gasket: EPDM elastomer; groove system: TGS — rolled groove.
Up to what temperature can TAVINOX GROOVE expansion joints be used?
In drinking water pipework up to 80 °C. For other media (e.g. heating) the operating temperature can be up to 110 °C.
What certification do TAVINOX GROOVE expansion joints have?
The TAVINOX GROOVE grooved system holds ITC product certificate No. 26 0151 V/AO for drinking water and heating installations, issued on 12 May 2026 by Institut pro testování a certifikaci, a.s. (authorised body No. 224, Czech Republic). The technical data list the certifications CCZ, ITC and ISO 9001. The TAVINOX GROOVE system was tested at ITC to DVGW standards; it does not hold a DVGW certificate of its own.
Can TAVINOX GROOVE expansion joints be connected to the TAVINOX PRESS press system?
Yes, with the grooved × press transition fittings: PR14GRF and TK14GRFGR — AISI 316L (1.4404); PR64GRF and TK64GRFGR — AISI 304 (1.4301). Their press end takes TAVINOX PRESS tubes of 76.1, 88.9 and 108 mm.
Buy online from our partners
TAVINOX is sold exclusively through wholesale and retail partners. Here are their online shops — you order directly from them. (TAVINOX GROOVE grooved system)
From each of these partners you buy the original TAVINOX system with all certifications and the manufacturer's warranty. All sales points and map →
Have a technical question?
A TAVINOX technician will personally answer your questions about the TAVINOX GROOVE grooved system.