28mm Concealed Single-Lever Washbasin Mixer

28mm concealed washbasin mixer tap – Treemme – wall-mounted stainless steel washbasin tap: a diagonally cut horizontal spout and a cylindrical control, on a 200 × 75 mm rectangular plate or on separate round rosettes. The spout can be chosen in approximately 180 or 220 mm, with the control on the right or left.

The 28mm collection, designed by Giampiero Castagnoli and Marco Pisati, is made from 28 mm stainless steel tubes joined at a right angle: a diagonally cut horizontal spout and a vertical cylinder that is itself the control. It is made entirely from AISI 316L stainless steel, satin-finished or in PVD colours.

What you receive: the external part (the plate or rosettes, spout and control), in the chosen model and finish; the concealed body only if you choose the complete set.

External part or complete set?

This product is wall-mounted and has two parts:

• external part – what is visible: handle, plate or rosettes, spout, in the chosen finish;
• concealed body (code RWIT 51A5 ZZ 01) – the part that is built into the wall by the plumber. It is not visible and is the same for all finishes.

Without the concealed body, the product cannot be installed. From the Set menu, choose:

• External part only – if you already have the Treemme concealed body installed in the wall (for example, if you are replacing a tap or the plumber has already installed it);
• Complete set with concealed body – for a new installation: you receive everything that is necessary.

Finishes

Satin stainless steel or one of the three PVD colours: gun metal, bronze and gold. PVD finishes are applied in a vacuum and are highly resistant to scratches and limescale.

Technical specifications

• External part codes (plate): RWIT 3BA5 / 3BA6 (control on the right, spout 177 / 220 mm), RWIT 3BA7 / 3BA9 (control on the left), finish .. and suffix 01 or G1 (with pin)
• External part codes (rosettes): RWIT 3BC5 / 3BC6 (control on the right, spout 180 / 222 mm), RWIT 3BC7 / 3BC9 (control on the left), suffix 01 or G1
• Concealed body code: RWIT 51A5 ZZ 01 (universal)
• Flow rate: 5 l/min
• Installation: wall-mounted
• Collection: 28mm – design by Giampiero Castagnoli and Marco Pisati
• Material: AISI 316L stainless steel, satin-finished or with PVD finish
• Manufacturer: Treemme Rubinetterie, Asciano (Siena) – Made in Italy

Complete dimensions are shown in the technical drawing in the image gallery.

Frequently asked questions

What does “control on the right” or “control on the left” mean?

With concealed taps, the control can be on the right or left of the spout, depending on what best suits the washbasin and the wall.

What does the “with pin” option mean?

The 28mm control is a rotating cylinder. The standard version has a smooth cylinder; the version with a pin has a small side pin, making it easier to operate. Both can be seen in the photographs.

Why stainless steel?

AISI 316L stainless steel is the same steel used in the food and shipbuilding industries: it does not rust, does not release metals into the water and is resistant to limescale and cleaning products. PVD finishes are applied in a vacuum and are highly resistant to scratches.

Do I need the concealed body?

Yes, it is mandatory for a new installation. Choose “Complete set with concealed body”. The “External part only” option is only for those who already have the Treemme concealed body installed in the wall.

How is it installed?

Installation is carried out by a plumber. For concealed models, the body is built into the wall before tiling, and the external part is fitted at the end.

How long does delivery take?

Delivery throughout Romania takes 0–6 weeks, depending on the finish. The displayed prices include VAT.

For projects, technical sheets or help choosing a finish, the IdeaCasa team is at your disposal – free consultation.