Geberit Mapress Stainless Steel Straight Union Pressfit 15mm to 54mm

On a pressed stainless line, the Geberit Mapress 316 stainless steel straight union pressfit gives you a joint that can be split again. Both pipes press into the fitting, and the union nut in the middle lets you break the joint with spanners.

Using a Geberit Mapress 316 stainless steel straight union pressfit

Press joints are permanent, which is fine for most of a run. But meters, pumps, water heaters and filters all need to come out at some point. So you put a union either side, and the kit can be lifted out without cutting pipe. That also means a quicker job for whoever services it next.

• Sizes: 15mm, 22mm, 28mm, 35mm, 42mm and 54mm
• Straight pattern, Press-Fit on both pipe ends
• Union in the centre so the joint can be undone
• Part of the Mapress stainless range in 1.4401 steel

Leave yourself enough room for a spanner on the nut when you set out the run. Make up the union first, line both pipes through, then mark the depth and press each side. If a pipe has been missed, the system shows it as a leak on the pressure test, because unpressed Mapress joints are not sealed.

Picking up unions in Glasgow

See our Geberit Mapress 316 stainless steel fittings for the reducers, couplings and adaptors that go with it.

Pick one up from Plumb Parts at 555 South Street, Glasgow G14 0QX, Mon-Fri 8am-5pm or Sat-Sun 8am-1pm. Online ordering works too.

Specification

• Brand: Geberit
• Range: Mapress 316 Stainless Steel
• Maker code: 35320 (15mm), 35322 (22mm), 35323 (28mm), 35324 (35mm), 35325 (42mm), 35326 (54mm)
• Material: CrNiMo 316 stainless steel 1.4401 (316)
• Connection: Press Fit socket at each end (black CIIR seal ring), union in the centre
• Sizes: 15mm, 22mm, 28mm, 35mm, 42mm and 54mm
• Max pressure: 16 bar for drinking water and heating water
• Max temperature: 100°C for drinking water and heating water without antifreeze
• Suitable for: Hot and cold drinking water, heating and cooling circuits, on Mapress 316 Stainless Steel system pipe

Common Questions

What is a straight union pressfit used for?

It joins two stainless pipes with a union in between, so the run can be split later without cutting. Put one next to a meter or filter that will need to come out.

Can I undo it under pressure?

No. Close the valves either side and drain that section first, then crack the nut slowly with a cloth ready for the water left in the pipe.

Is there a bigger union than 54mm?

Not on this listing, which stops at 54mm. On larger stainless pipe a flanged joint is the usual way to make a break point.

Datasheets

• Geberit Mapress 316 Stainless Steel Application Overview (Liquid Media) (PDF)