By Flo Control



Part # 170020

Dimensions 21" L x 21" W x 13.5" D

Alternate Part #'s FLO170020

Product Description

True Union Spring Check valve. Easy entry removable body, for visual inspections or cleaning. Available in clear. Each valve is specially designed to be disassembled by unscrewing the nuts in line leaving the tail pieces solvent cemented to the pipe. This true union allows you to remove the body for repairs, or cleaning, even providing the opportunity to change the body or spring tension. The 170020 valve is white.

Sizes 1½" & 2" IPS
Standard spring tension ½ lb. (other spring loads available on special request)
EPDM seal and "O" Rings
200 PSI static pressure rating @ 72ºF
Stainless steel spring
Valve Body Length = 9.735" (Body Length Includes Unions)
Excess solvent trap

Product Specifications

2 in.
1/2 lbs.

?     Asked on 1/18/2012by Guest

Is it possible to purchase just the insert part of this as a replacement?

A  Answered on 1/18/2012 by InyoPools Product Specialist Patrick P.

There is no replacement part for that and you would need to replace the whole unit.

?     Asked on 3/2/2015by PRJ

This check valve comes with either 1/2 lb or 2 lb springs. When would I need a 2 lb spring?

A  Answered on 3/3/2015 by InyoPools Product Specialist Robert M.

Most systems will only require a 1/2 lb spring. The 2 lb spring is required for situations with greater head or backflow pressure. An example would be solar panels mounted on an 8' high roof.

?     Asked on 9/30/2016by Don

Can the 1700C15 check valve be supplied with Viton seat material. EPDM doesn't have very good compatibility with chlorine and doesn't provide satisfactory service life.

A  Answered on 10/4/2016 by InyoPools Product Specialist Lennox H.

Hi, Don. Unfortunately, the 1700C15 is not available with Vition seals.

?     Asked on 3/8/2019by Inyo Visitor

installed this valve on the suction side of my new pump. Now my pump won't prime. I think the suction from the pump won't pull the spring valve open?

A  Answered on 3/13/2019 by InyoPools Product Specialist Lennox H.

Hi. This check valve has a 1/2 lb spring, your pump should be sufficient to open the mechanism. I would check to see if the valve was installed correctly. The arrow pointing towards the pump inlet.

?     Asked on 5/3/2021by SAMUEL MALAVE

is this valve spring loaded or is it a flapper type?

A  Answered on 5/3/2021 by InyoPools Product Specialist Patrick P.

This is a spring-loaded check valve.


Est. Repair Time

Less than 1 hr

Tools Needed

hack saw

Needed a Check Valve

Written on 11/28/2018 by Guest

This check valve is simple to put on. All that is needed is a saw and glue.

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 (Average 4.6  out of 5 stars)
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