---
kind: "section"
citation: "46 C.F.R. § 95.16-25"
title: "46"
number: "95.16-25"
heading: "Manifold and cylinder arrangements."
url: "https://uscodex.org/cfr/46/95.16-25"
---

# §95.16-25. Manifold and cylinder arrangements.

- (a) A check valve must be provided between each cylinder and manifold or distribution piping. The valve must be permanently marked to indicate the direction of flow.
- (b) If the same cylinder is used to protect more than one space, normally, closed stop valves must be provided to direct the agent into each protected space.
- (c) Each cylinder must be fabricated, tested, and marked in accordance with 46 CFR [147.60(b)](/cfr/46/147.60.md?p=b) and [49](/cfr/46/49.md) CFR [part 180](/cfr/46/part180.md).
- (d) The cylinders in a common manifold must be:
  - (1) Of the same size;
  - (2) Filled with the same amount of agent; and
  - (3) **Pressurized to the same working pressure.**

## Notes

### Source

Source: USCG-2006-24797, 77 FR 33879, June 7, 2012, unless otherwise noted.

### Authority

Authority: 46 U.S.C. 3306; E.O. 12234, 45 FR 58801, 3 CFR, 1980 Comp., p. 277; DHS Delegation No. 00170.1, Revision No. 01.4.

### Source

Source: CGFR 65-50, 30 FR 17001, Dec. 30, 1965, unless otherwise noted.