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An in-line water hammer arrester comprises a housing connectable at each end to a piping system, a fluid channel disposed within the housing to permit fluid to flow from the piping system through the housing and back into the piping system, a piston and a pressurized chamber. When a pressure spike o

An in-line water hammer arrester comprises a housing connectable at each end to a piping system, a fluid channel disposed within the housing to permit fluid to flow from the piping system through the housing and back into the piping system, a piston and a pressurized chamber. When a pressure spike occurs, the piston is pushed against the pressurized chamber allowing an expanded area for water flow until the pressure spike is dissipated and the piston returns to its resting position. When used with flexible hoses and tubing typically found with household appliance water supply lines, the in-line arrester is easily installed by a crimping or clamping type connector and takes up little space.

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1. A pressure spike reducing apparatus comprising: an outer housing;an interior housing disposed within the outer housing, the interior housing comprising a substantially cylindrical body having a first diameter, the body having an annular shoulder at a first end forming an aperture with a second di

1. A pressure spike reducing apparatus comprising: an outer housing;an interior housing disposed within the outer housing, the interior housing comprising a substantially cylindrical body having a first diameter, the body having an annular shoulder at a first end forming an aperture with a second diameter smaller than the first diameter and the body having a second sealed end;a fluid channel permitting the flow of fluid through the apparatus from an upstream end and out a downstream end, wherein at least a portion of the fluid channel is disposed in an annular space between the outer housing and interior housing;a piston disposed within the interior housing in a first position when no pressure spike in the fluid channel is occurring and configured to temporarily move to a second position within the interior housing in response to a pressure spike in the fluid channel;a sealed pressurized chamber disposed within the interior housing between the piston and the sealed end, wherein the pressurized chamber has an internal pressure that is only adjustable by movement of the piston within the outer housing;a first connector comprising a substantially cylindrical neck disposed at an end of the apparatus and a second connector comprising a substantially cylindrical neck disposed at another end of the apparatus; andwherein each connector is configured to selectively connect the apparatus to a pipe, flexible hose, valve, or semi-rigid PEX riser to permit the flow of fluid through the fluid channel; andwherein at least one of the connectors is integrally formed with the outer housing or the inner housing or both. 2. The apparatus of claim 1 wherein the piston comprises: a substantially cylindrical sidewall with an open end disposed toward the annular shoulder of the interior housing body and a closed end disposed toward the sealed end of the interior housing body; anda rounded shoulder between the sidewall and closed end. 3. The apparatus of claim 2 wherein the open end of the piston has a diameter slightly larger than that of the annular shoulder to retain the piston within the interior housing. 4. The apparatus of claim 2 wherein the piston further comprises one or more annular protrusions or annular recesses along the sidewall, each configured to receive a sealing ring disposed between the piston and the interior housing. 5. The apparatus of claim 1 wherein the outer housing comprises two separate bodies that at least partially overlap and are sealed together. 6. A pressure spike reducing apparatus comprising: an outer housing;an interior housing disposed within the outer housing, the interior housing comprising a substantially cylindrical body having a first diameter, the body having an annular shoulder at a first end forming an aperture with a second diameter smaller than the first diameter and the body having a second sealed end;a fluid channel permitting the flow of fluid through the apparatus from an upstream end and out a downstream end, wherein at least a portion of the fluid channel is disposed in an annular space between the outer housing and interior housing;a piston disposed within the interior housing in a first position when no pressure spike in the fluid channel is occurring and configured to temporarily move to a second position within the interior housing in response to a pressure spike in the fluid channel;a sealed pressurized chamber disposed within the interior housing between the piston and the sealed end, wherein the pressurized chamber has an internal pressure that is only adjustable by movement of the piston within the outer housing;a first connector comprising a substantially cylindrical neck disposed at an end of the apparatus and a second connector comprising a substantially cylindrical neck disposed at another end of the apparatus; andwherein each connector is configured to selectively connect the apparatus to a pipe, flexible hose, valve, or semi-rigid PEX riser to permit the flow of fluid through the fluid channel; andwherein at least a portion of the neck of the connector disposed at the end of the apparatus nearest the aperture in the interior housing extends inwardly to abut a portion of the annular shoulder to block movement of the interior housing without substantially blocking the flow of fluid through the fluid channel. 7. The apparatus of claim 6 wherein the interior housing further comprises at least one arm extending outwardly from the annular shoulder, the arm configured to engage with the portion of the neck extending inwardly. 8. The apparatus of claim 6 wherein the outer housing comprises at least one rib disposed on an interior surface of the outer housing near the sealed end of the interior housing body, the rib configured to block movement of the interior housing without substantially blocking the flow of fluid through the fluid channel. 9. A pressure spike reducing apparatus comprising: an outer housing;an interior housing disposed within the outer housing, the interior housing comprising a substantially cylindrical body having a first diameter, the body having an annular shoulder at a first end forming an aperture with a second diameter smaller than the first diameter and the body having a second sealed end;a fluid channel permitting the flow of fluid through the apparatus from an upstream end and out a downstream end, wherein at least a portion of the fluid channel is disposed in an annular space between the outer housing and interior housing;a piston disposed within the interior housing in a first position when no pressure spike in the fluid channel is occurring and configured to temporarily move to a second position within the interior housing in response to a pressure spike in the fluid channel; anda sealed pressurized chamber disposed within the interior housing between the piston and the sealed end, wherein the pressurized chamber has an internal pressure that is only adjustable by movement of the piston within the outer housing; andwherein the outer housing comprises at least one rib disposed on an interior surface of the outer housing, the rib configured to block movement of the interior housing without substantially blocking the flow of fluid through the fluid channel. 10. The apparatus of claim 9 wherein at least one rib is disposed near the annular shoulder of the interior housing and wherein the interior housing further comprises at least one arm extending outwardly from the annular shoulder, the arm configured to engage with the rib. 11. A pressure spike reducing apparatus comprising: an outer housinq comprising two separate bodies that at least partially overlap and are sealed together, each body comprising a connector having an outwardly extending substantially cylindrical neck configured to selectively connect the apparatus to a pipe, flexible hose, valve, or semi-rigid PEX riser to permit the flow of fluid through the fluid channel;an interior housing disposed within the outer housing, the interior housing comprising a substantially cylindrical body having a first diameter, the body having an annular shoulder at a first end forming an aperture with a second diameter smaller than the first diameter and the body having a second sealed end;a fluid channel permitting the flow of fluid through the apparatus from an upstream end and out a downstream end, wherein at least a portion of the fluid channel is disposed in an annular space between the outer housing and interior housing;a piston disposed within the interior housing in a first position when no pressure spike in the fluid channel is occurring and configured to temporarily move to a second position within the interior housing in response to a pressure spike in the fluid channel; anda sealed pressurized chamber disposed within the interior housing between the piston and the sealed end, wherein the pressurized chamber has an internal pressure that is only adjustable by movement of the piston within the outer housing; andwherein the interior housing is integrally formed with one of the bodies of the outer housing. 12. A pressure spike reducing apparatus comprising: an outer housing comprising two separate bodies that at least partially overlap and are sealed together, each body comprising a connector having an outwardly extending substantially cylindrical neck configured to selectively connect the apparatus to a pipe, flexible hose, valve, or semi-rigid PEX riser to permit the flow of fluid through the fluid channel;an interior housing disposed within the outer housing, the interior housing comprising a substantially cylindrical body having a first diameter, the body having an annular shoulder at a first end forming an aperture with a second diameter smaller than the first diameter and the body having a second sealed end;a fluid channel permitting the flow of fluid through the apparatus from an upstream end and out a downstream end, wherein at least a portion of the fluid channel is disposed in an annular space between the outer housing and interior housing;a piston disposed within the interior housing in a first position when no pressure spike in the fluid channel is occurring and configured to temporarily move to a second position within the interior housing in response to a pressure spike in the fluid channel; anda sealed pressurized chamber disposed within the interior housing between the piston and the sealed end, wherein the pressurized chamber has an internal pressure that is only adjustable by movement of the piston within the outer housing; andwherein at least a portion of the neck of the connector disposed at the end of the apparatus nearest the aperture in the interior housing extends inwardly to abut a portion of the annular shoulder to block movement of the interior housing without substantially blocking the flow of fluid through the fluid channel. 13. The apparatus of claim 12 wherein the interior housing further comprises at least one arm extending outwardly from the annular shoulder, the arm configured to engage with the portion of the neck extending inwardly.