400 Series | Anti-Siphon Wall Hydrant

PRIER 400 Series provides a year round source of water in areas that are subject to freezing temperatures. The hydrant valve is connected to the supply piping in the heated portion of the structure, eliminating the possibility of freezing. The PRIER 400 Series features a half-turn design for years of easy operation.

The PRIER 400 Series has all the characteristics of the proven 300 Series Wall Hydrant, with the added protection of a vacuum breaker and backflow preventer. It is available from stock in lengths close coupled to 14”.

Identify your Mansfield style hydrant here.

Product Support

PRIER's 400 Series hydrants are the current "half-turn" lawn faucet with a vacuum breaker cap above the handle. This valve was originally the "Mansfield 578" hydrant (multi-turn) that was made by the Mansfield Plumbing Company in Perrysville, Ohio. While PRIER has service parts for the original Mansfield 500 Series valve, it is no longer manufactured. The PRIER 400 Series lawn faucet (half-turn) is now made by PRIER in our Grandview, Missouri plant. It is a simple operating product and is fairly simple to repair.

1. When the water is running, water leaks out from behind the handle

This is a common maintenance occurrence for any packed valve of any brand or manufacture. It is overcome by simply tightening the plastic packing nut. The packing nut is a left hand or reverse threaded nut (older style hydrants may have a right hand threaded nut). This will force the packing tighter around the stem to eliminate leakage. Occasionally, the packing will need to be replaced if the packing nut has been repeatedly tightened.

The parts required for this are included in the service kit part number 630-7755.

Click here to watch the video

2. The hydrant drips after shut off

Since a freezeless hydrant actually shuts off inside the heated portion of the structure, the water inside the hydrant will drain out after shutoff. The shutoff point could be any distance from 4" to 14" inside the structure. This installation should also be pitched to allow the water to easily drain out of the hydrant. The hydrant may drip for up to 60 seconds after shutoff. If the water continues to drip after that time, you most likely need to replace the seat washer. This is a "OO Beveled Seat Washer" and is included in the service kit part number 630-7755.

Click here to watch the video

3. Water leaks from under the plastic cap on top of the valve

The vacuum breaker has begun to leak. This happens when the plastic cap is ruptured by freezing, this often occurs when the hose is left on the valve, or the rubber seating surface needs to be replaced. This vacuum breaker threads out of the valve, and the replacement threads into the valve.

The parts required for this are included in part number 630-7500 Vacuum Breaker Replacement kit.

*PLEASE NOTE: Since the creation of this video, we have updated our vacuum breakers to aluminum caps as shown above. The C-144KT-806 and 630-7500 are now universal vacuum breaker kits and will fit all past and present PRIER and Mansfield style residential hydrants.

4. Water is leaking from the hydrant inside my house

Unfortunately, your freezeless hydrant is broken, most likely beyond repair. This happens when the water becomes trapped within the hydrant. The water freezes, expands and ruptures the copper shaft of the hydrant located on the inside the structure. The most common reason for this problem is leaving the garden hose attached during freezing weather, or the hydrant was not installed with the proper drainage pitch.

DO NOT OPERATE THE HYDRANT IF THIS HAS OCCURRED.

Please remove the handle to prevent accidental operation until the problem is repaired by your plumber.

5. The handle is missing from my hydrant

For any one of numerous reasons, your handle may be missing. PRIER's Mansfield Style handle is unique to the Mansfield Style products. This style handle mates perfectly with our stem-end for a snug fit and years of reliable operation.

The required kit is part number 630-7965.

6. The stem end is damaged and I cannot operate the freezeless hydrant

Occasionally the stem of the PRIER Mansfield Style Freezeless Hydrant gets damaged beyond repair. This is most commonly caused by the hydrant being operated by pliers and damaging the brass on the end.

To determine the proper replacement stem, you will need to determine the length of the stem, from brass tip to brass tip. This will give you the Overall Length (OAL) of the stem. Next, please use the following document to match up the correct part number: Identifying Your Mansfield Style Hydrant

7. The spring (seat) end is damaged and you cannot operate the freezeless hydrant

The stems for the old style 400 and 500 Series are spring loaded at the seat end. You should be able to easily push in the end and it should immediately pop back out. If the spring end is stuck, your hydrant will not open and close properly.

To determine the proper replacement stem, you will need to determine the length of the stem, from brass tip to brass tip. This will give you the Overall Length (OAL) of the stem. Next, please use the following document to match up the correct part number: Identifying Your Mansfield Style Hydrant

8. I need a complete rebuild kit

The 400/500 Series Mansfield Style wall hydrants have the following repair kits:

Part number 630-7755 Service Kit

 

Part Number 630-7965 Replacement Handle Kit

 

Part Number 630-7500 Vacuum Breaker Repair Kit

9. How do I assemble parts on the stem?

All wearable parts on the stem are available in service kit part number 630-7755.