---
kind: "section"
citation: "21 C.F.R. § 868.1965"
title: "21"
number: "868.1965"
heading: "Switching valve (ploss)."
url: "https://uscodex.org/cfr/21/868.1965"
---

# §868.1965. Switching valve (ploss).

- (a) **Identification.** A switching valve (ploss) is a three-way valve located between a stethoscope placed over the heart, a blood pressure cuff, and an earpiece. The valve allows the user to eliminate one sound channel and listen only to a patient's heart or korotkoff (blood pressure) sounds through the other channel.
- (b) **Classification.** Class I (general controls). The device is exempt from the premarket notification procedures in [subpart E of part 807](/cfr/21/part807-subpartE.md) of this chapter subject to the limitations in [§ 868.9](/cfr/21/868.9.md). The device is also exempt from the current good manufacturing practice requirements of the quality management system regulation in [part 820](/cfr/21/part820.md) of this chapter, except for requirements concerning records and complaint files under [§ 820.35](/cfr/21/820.35.md) of this chapter.

## Notes

### Amendments

[47 FR 31142, July 16, 1982, as amended at 54 FR 25048, June 12, 1989; 66 FR 38793, July 25, 2001; 90 FR 55982, Dec. 4, 2025]

### Authority

Authority: 21 U.S.C. 351, 360, 360c, 360e, 360j, 360 l, 371.

### Source

Source: 47 FR 31142, July 16, 1982, unless otherwise noted.

### Amendments

[47 FR 31142, July 16, 1982, as amended at 54 FR 25048, June 12, 1989; 66 FR 38793, July 25, 2001; 90 FR 55982, Dec. 4, 2025]