for dual flush or start & stop actuation | for pneumatic discharge valve AV1 | vertical installation | 156 x 197 mm | made of ABS | GROHE Water Saving - Less water, perfect flow | GROHE Long-Life Shine durable sparkling sheen | for combination with Rapid SL and Uniset with GD 2 cistern | for use with Rapid SLX please order shaft 66 791 000 (sold separately)