PPT20H Release Valve Kit. Genuine STAXX PPT20H Release Valve Kit - Part #31201024. The release valve assembly consists of the following parts: Release Valve Housing Release Valve with 2 Seal Grooves Release Valve Housing Seal Release Valve Spring and 2 Seals The correct assembly procedure is: Fit the two seals on to the piston Insert the piston in to the valve housing Slide the housing seal over the threaded part of the valve And finally, place the spring on the inboard end of the piston Once assembled, the complete assembly can be installed in to the hydraulic pump unit. Fits the following models: CBD20-WS-SE Part # 21 on the diagram. We are a leading UK supplier of spare and replacement parts for manual and electric hand pallet trucks / pump jacks, stackers, high lifters, tow trucks, scissor lift tables, platform lifters, and warehouse handling equipment. UK Stock. Fast Delivery. We pride ourselves on excellent Customer Service. We are a SafeContractor™ Approved Company.